diff --git a/vendor/go.etcd.io/etcd/client/README.md b/vendor/go.etcd.io/etcd/client/README.md
new file mode 100644
index 0000000..521d6c0
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/client/README.md
@@ -0,0 +1,112 @@
+# etcd/client
+
+etcd/client is the Go client library for etcd.
+
+[![GoDoc](https://godoc.org/go.etcd.io/etcd/client?status.png)](https://godoc.org/go.etcd.io/etcd/client)
+
+For full compatibility, it is recommended to vendor builds using etcd's vendored packages, using tools like `golang/dep`, as in [vendor directories](https://golang.org/cmd/go/#hdr-Vendor_Directories).
+
+## Install
+
+```bash
+go get go.etcd.io/etcd/client
+```
+
+## Usage
+
+```go
+package main
+
+import (
+	"log"
+	"time"
+	"context"
+
+	"go.etcd.io/etcd/client"
+)
+
+func main() {
+	cfg := client.Config{
+		Endpoints:               []string{"http://127.0.0.1:2379"},
+		Transport:               client.DefaultTransport,
+		// set timeout per request to fail fast when the target endpoint is unavailable
+		HeaderTimeoutPerRequest: time.Second,
+	}
+	c, err := client.New(cfg)
+	if err != nil {
+		log.Fatal(err)
+	}
+	kapi := client.NewKeysAPI(c)
+	// set "/foo" key with "bar" value
+	log.Print("Setting '/foo' key with 'bar' value")
+	resp, err := kapi.Set(context.Background(), "/foo", "bar", nil)
+	if err != nil {
+		log.Fatal(err)
+	} else {
+		// print common key info
+		log.Printf("Set is done. Metadata is %q\n", resp)
+	}
+	// get "/foo" key's value
+	log.Print("Getting '/foo' key value")
+	resp, err = kapi.Get(context.Background(), "/foo", nil)
+	if err != nil {
+		log.Fatal(err)
+	} else {
+		// print common key info
+		log.Printf("Get is done. Metadata is %q\n", resp)
+		// print value
+		log.Printf("%q key has %q value\n", resp.Node.Key, resp.Node.Value)
+	}
+}
+```
+
+## Error Handling
+
+etcd client might return three types of errors.
+
+- context error
+
+Each API call has its first parameter as `context`. A context can be canceled or have an attached deadline. If the context is canceled or reaches its deadline, the responding context error will be returned no matter what internal errors the API call has already encountered.
+
+- cluster error
+
+Each API call tries to send request to the cluster endpoints one by one until it successfully gets a response. If a requests to an endpoint fails, due to exceeding per request timeout or connection issues, the error will be added into a list of errors. If all possible endpoints fail, a cluster error that includes all encountered errors will be returned.
+
+- response error
+
+If the response gets from the cluster is invalid, a plain string error will be returned. For example, it might be a invalid JSON error.
+
+Here is the example code to handle client errors:
+
+```go
+cfg := client.Config{Endpoints: []string{"http://etcd1:2379","http://etcd2:2379","http://etcd3:2379"}}
+c, err := client.New(cfg)
+if err != nil {
+	log.Fatal(err)
+}
+
+kapi := client.NewKeysAPI(c)
+resp, err := kapi.Set(ctx, "test", "bar", nil)
+if err != nil {
+	if err == context.Canceled {
+		// ctx is canceled by another routine
+	} else if err == context.DeadlineExceeded {
+		// ctx is attached with a deadline and it exceeded
+	} else if cerr, ok := err.(*client.ClusterError); ok {
+		// process (cerr.Errors)
+	} else {
+		// bad cluster endpoints, which are not etcd servers
+	}
+}
+```
+
+
+## Caveat
+
+1. etcd/client prefers to use the same endpoint as long as the endpoint continues to work well. This saves socket resources, and improves efficiency for both client and server side. This preference doesn't remove consistency from the data consumed by the client because data replicated to each etcd member has already passed through the consensus process.
+
+2. etcd/client does round-robin rotation on other available endpoints if the preferred endpoint isn't functioning properly. For example, if the member that etcd/client connects to is hard killed, etcd/client will fail on the first attempt with the killed member, and succeed on the second attempt with another member. If it fails to talk to all available endpoints, it will return all errors happened.
+
+3. Default etcd/client cannot handle the case that the remote server is SIGSTOPed now. TCP keepalive mechanism doesn't help in this scenario because operating system may still send TCP keep-alive packets. Over time we'd like to improve this functionality, but solving this issue isn't high priority because a real-life case in which a server is stopped, but the connection is kept alive, hasn't been brought to our attention.
+
+4. etcd/client cannot detect whether a member is healthy with watches and non-quorum read requests. If the member is isolated from the cluster, etcd/client may retrieve outdated data. Instead, users can either issue quorum read requests or monitor the /health endpoint for member health information.
diff --git a/vendor/go.etcd.io/etcd/client/auth_role.go b/vendor/go.etcd.io/etcd/client/auth_role.go
new file mode 100644
index 0000000..b6ba7e1
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/client/auth_role.go
@@ -0,0 +1,236 @@
+// Copyright 2015 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/url"
+)
+
+type Role struct {
+	Role        string       `json:"role"`
+	Permissions Permissions  `json:"permissions"`
+	Grant       *Permissions `json:"grant,omitempty"`
+	Revoke      *Permissions `json:"revoke,omitempty"`
+}
+
+type Permissions struct {
+	KV rwPermission `json:"kv"`
+}
+
+type rwPermission struct {
+	Read  []string `json:"read"`
+	Write []string `json:"write"`
+}
+
+type PermissionType int
+
+const (
+	ReadPermission PermissionType = iota
+	WritePermission
+	ReadWritePermission
+)
+
+// NewAuthRoleAPI constructs a new AuthRoleAPI that uses HTTP to
+// interact with etcd's role creation and modification features.
+func NewAuthRoleAPI(c Client) AuthRoleAPI {
+	return &httpAuthRoleAPI{
+		client: c,
+	}
+}
+
+type AuthRoleAPI interface {
+	// AddRole adds a role.
+	AddRole(ctx context.Context, role string) error
+
+	// RemoveRole removes a role.
+	RemoveRole(ctx context.Context, role string) error
+
+	// GetRole retrieves role details.
+	GetRole(ctx context.Context, role string) (*Role, error)
+
+	// GrantRoleKV grants a role some permission prefixes for the KV store.
+	GrantRoleKV(ctx context.Context, role string, prefixes []string, permType PermissionType) (*Role, error)
+
+	// RevokeRoleKV revokes some permission prefixes for a role on the KV store.
+	RevokeRoleKV(ctx context.Context, role string, prefixes []string, permType PermissionType) (*Role, error)
+
+	// ListRoles lists roles.
+	ListRoles(ctx context.Context) ([]string, error)
+}
+
+type httpAuthRoleAPI struct {
+	client httpClient
+}
+
+type authRoleAPIAction struct {
+	verb string
+	name string
+	role *Role
+}
+
+type authRoleAPIList struct{}
+
+func (list *authRoleAPIList) HTTPRequest(ep url.URL) *http.Request {
+	u := v2AuthURL(ep, "roles", "")
+	req, _ := http.NewRequest("GET", u.String(), nil)
+	req.Header.Set("Content-Type", "application/json")
+	return req
+}
+
+func (l *authRoleAPIAction) HTTPRequest(ep url.URL) *http.Request {
+	u := v2AuthURL(ep, "roles", l.name)
+	if l.role == nil {
+		req, _ := http.NewRequest(l.verb, u.String(), nil)
+		return req
+	}
+	b, err := json.Marshal(l.role)
+	if err != nil {
+		panic(err)
+	}
+	body := bytes.NewReader(b)
+	req, _ := http.NewRequest(l.verb, u.String(), body)
+	req.Header.Set("Content-Type", "application/json")
+	return req
+}
+
+func (r *httpAuthRoleAPI) ListRoles(ctx context.Context) ([]string, error) {
+	resp, body, err := r.client.Do(ctx, &authRoleAPIList{})
+	if err != nil {
+		return nil, err
+	}
+	if err = assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
+		return nil, err
+	}
+	var roleList struct {
+		Roles []Role `json:"roles"`
+	}
+	if err = json.Unmarshal(body, &roleList); err != nil {
+		return nil, err
+	}
+	ret := make([]string, 0, len(roleList.Roles))
+	for _, r := range roleList.Roles {
+		ret = append(ret, r.Role)
+	}
+	return ret, nil
+}
+
+func (r *httpAuthRoleAPI) AddRole(ctx context.Context, rolename string) error {
+	role := &Role{
+		Role: rolename,
+	}
+	return r.addRemoveRole(ctx, &authRoleAPIAction{
+		verb: "PUT",
+		name: rolename,
+		role: role,
+	})
+}
+
+func (r *httpAuthRoleAPI) RemoveRole(ctx context.Context, rolename string) error {
+	return r.addRemoveRole(ctx, &authRoleAPIAction{
+		verb: "DELETE",
+		name: rolename,
+	})
+}
+
+func (r *httpAuthRoleAPI) addRemoveRole(ctx context.Context, req *authRoleAPIAction) error {
+	resp, body, err := r.client.Do(ctx, req)
+	if err != nil {
+		return err
+	}
+	if err := assertStatusCode(resp.StatusCode, http.StatusOK, http.StatusCreated); err != nil {
+		var sec authError
+		err := json.Unmarshal(body, &sec)
+		if err != nil {
+			return err
+		}
+		return sec
+	}
+	return nil
+}
+
+func (r *httpAuthRoleAPI) GetRole(ctx context.Context, rolename string) (*Role, error) {
+	return r.modRole(ctx, &authRoleAPIAction{
+		verb: "GET",
+		name: rolename,
+	})
+}
+
+func buildRWPermission(prefixes []string, permType PermissionType) rwPermission {
+	var out rwPermission
+	switch permType {
+	case ReadPermission:
+		out.Read = prefixes
+	case WritePermission:
+		out.Write = prefixes
+	case ReadWritePermission:
+		out.Read = prefixes
+		out.Write = prefixes
+	}
+	return out
+}
+
+func (r *httpAuthRoleAPI) GrantRoleKV(ctx context.Context, rolename string, prefixes []string, permType PermissionType) (*Role, error) {
+	rwp := buildRWPermission(prefixes, permType)
+	role := &Role{
+		Role: rolename,
+		Grant: &Permissions{
+			KV: rwp,
+		},
+	}
+	return r.modRole(ctx, &authRoleAPIAction{
+		verb: "PUT",
+		name: rolename,
+		role: role,
+	})
+}
+
+func (r *httpAuthRoleAPI) RevokeRoleKV(ctx context.Context, rolename string, prefixes []string, permType PermissionType) (*Role, error) {
+	rwp := buildRWPermission(prefixes, permType)
+	role := &Role{
+		Role: rolename,
+		Revoke: &Permissions{
+			KV: rwp,
+		},
+	}
+	return r.modRole(ctx, &authRoleAPIAction{
+		verb: "PUT",
+		name: rolename,
+		role: role,
+	})
+}
+
+func (r *httpAuthRoleAPI) modRole(ctx context.Context, req *authRoleAPIAction) (*Role, error) {
+	resp, body, err := r.client.Do(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+	if err = assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
+		var sec authError
+		err = json.Unmarshal(body, &sec)
+		if err != nil {
+			return nil, err
+		}
+		return nil, sec
+	}
+	var role Role
+	if err = json.Unmarshal(body, &role); err != nil {
+		return nil, err
+	}
+	return &role, nil
+}
diff --git a/vendor/go.etcd.io/etcd/client/auth_user.go b/vendor/go.etcd.io/etcd/client/auth_user.go
new file mode 100644
index 0000000..8e7e2ef
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/client/auth_user.go
@@ -0,0 +1,319 @@
+// Copyright 2015 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/url"
+	"path"
+)
+
+var (
+	defaultV2AuthPrefix = "/v2/auth"
+)
+
+type User struct {
+	User     string   `json:"user"`
+	Password string   `json:"password,omitempty"`
+	Roles    []string `json:"roles"`
+	Grant    []string `json:"grant,omitempty"`
+	Revoke   []string `json:"revoke,omitempty"`
+}
+
+// userListEntry is the user representation given by the server for ListUsers
+type userListEntry struct {
+	User  string `json:"user"`
+	Roles []Role `json:"roles"`
+}
+
+type UserRoles struct {
+	User  string `json:"user"`
+	Roles []Role `json:"roles"`
+}
+
+func v2AuthURL(ep url.URL, action string, name string) *url.URL {
+	if name != "" {
+		ep.Path = path.Join(ep.Path, defaultV2AuthPrefix, action, name)
+		return &ep
+	}
+	ep.Path = path.Join(ep.Path, defaultV2AuthPrefix, action)
+	return &ep
+}
+
+// NewAuthAPI constructs a new AuthAPI that uses HTTP to
+// interact with etcd's general auth features.
+func NewAuthAPI(c Client) AuthAPI {
+	return &httpAuthAPI{
+		client: c,
+	}
+}
+
+type AuthAPI interface {
+	// Enable auth.
+	Enable(ctx context.Context) error
+
+	// Disable auth.
+	Disable(ctx context.Context) error
+}
+
+type httpAuthAPI struct {
+	client httpClient
+}
+
+func (s *httpAuthAPI) Enable(ctx context.Context) error {
+	return s.enableDisable(ctx, &authAPIAction{"PUT"})
+}
+
+func (s *httpAuthAPI) Disable(ctx context.Context) error {
+	return s.enableDisable(ctx, &authAPIAction{"DELETE"})
+}
+
+func (s *httpAuthAPI) enableDisable(ctx context.Context, req httpAction) error {
+	resp, body, err := s.client.Do(ctx, req)
+	if err != nil {
+		return err
+	}
+	if err = assertStatusCode(resp.StatusCode, http.StatusOK, http.StatusCreated); err != nil {
+		var sec authError
+		err = json.Unmarshal(body, &sec)
+		if err != nil {
+			return err
+		}
+		return sec
+	}
+	return nil
+}
+
+type authAPIAction struct {
+	verb string
+}
+
+func (l *authAPIAction) HTTPRequest(ep url.URL) *http.Request {
+	u := v2AuthURL(ep, "enable", "")
+	req, _ := http.NewRequest(l.verb, u.String(), nil)
+	return req
+}
+
+type authError struct {
+	Message string `json:"message"`
+	Code    int    `json:"-"`
+}
+
+func (e authError) Error() string {
+	return e.Message
+}
+
+// NewAuthUserAPI constructs a new AuthUserAPI that uses HTTP to
+// interact with etcd's user creation and modification features.
+func NewAuthUserAPI(c Client) AuthUserAPI {
+	return &httpAuthUserAPI{
+		client: c,
+	}
+}
+
+type AuthUserAPI interface {
+	// AddUser adds a user.
+	AddUser(ctx context.Context, username string, password string) error
+
+	// RemoveUser removes a user.
+	RemoveUser(ctx context.Context, username string) error
+
+	// GetUser retrieves user details.
+	GetUser(ctx context.Context, username string) (*User, error)
+
+	// GrantUser grants a user some permission roles.
+	GrantUser(ctx context.Context, username string, roles []string) (*User, error)
+
+	// RevokeUser revokes some permission roles from a user.
+	RevokeUser(ctx context.Context, username string, roles []string) (*User, error)
+
+	// ChangePassword changes the user's password.
+	ChangePassword(ctx context.Context, username string, password string) (*User, error)
+
+	// ListUsers lists the users.
+	ListUsers(ctx context.Context) ([]string, error)
+}
+
+type httpAuthUserAPI struct {
+	client httpClient
+}
+
+type authUserAPIAction struct {
+	verb     string
+	username string
+	user     *User
+}
+
+type authUserAPIList struct{}
+
+func (list *authUserAPIList) HTTPRequest(ep url.URL) *http.Request {
+	u := v2AuthURL(ep, "users", "")
+	req, _ := http.NewRequest("GET", u.String(), nil)
+	req.Header.Set("Content-Type", "application/json")
+	return req
+}
+
+func (l *authUserAPIAction) HTTPRequest(ep url.URL) *http.Request {
+	u := v2AuthURL(ep, "users", l.username)
+	if l.user == nil {
+		req, _ := http.NewRequest(l.verb, u.String(), nil)
+		return req
+	}
+	b, err := json.Marshal(l.user)
+	if err != nil {
+		panic(err)
+	}
+	body := bytes.NewReader(b)
+	req, _ := http.NewRequest(l.verb, u.String(), body)
+	req.Header.Set("Content-Type", "application/json")
+	return req
+}
+
+func (u *httpAuthUserAPI) ListUsers(ctx context.Context) ([]string, error) {
+	resp, body, err := u.client.Do(ctx, &authUserAPIList{})
+	if err != nil {
+		return nil, err
+	}
+	if err = assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
+		var sec authError
+		err = json.Unmarshal(body, &sec)
+		if err != nil {
+			return nil, err
+		}
+		return nil, sec
+	}
+
+	var userList struct {
+		Users []userListEntry `json:"users"`
+	}
+
+	if err = json.Unmarshal(body, &userList); err != nil {
+		return nil, err
+	}
+
+	ret := make([]string, 0, len(userList.Users))
+	for _, u := range userList.Users {
+		ret = append(ret, u.User)
+	}
+	return ret, nil
+}
+
+func (u *httpAuthUserAPI) AddUser(ctx context.Context, username string, password string) error {
+	user := &User{
+		User:     username,
+		Password: password,
+	}
+	return u.addRemoveUser(ctx, &authUserAPIAction{
+		verb:     "PUT",
+		username: username,
+		user:     user,
+	})
+}
+
+func (u *httpAuthUserAPI) RemoveUser(ctx context.Context, username string) error {
+	return u.addRemoveUser(ctx, &authUserAPIAction{
+		verb:     "DELETE",
+		username: username,
+	})
+}
+
+func (u *httpAuthUserAPI) addRemoveUser(ctx context.Context, req *authUserAPIAction) error {
+	resp, body, err := u.client.Do(ctx, req)
+	if err != nil {
+		return err
+	}
+	if err = assertStatusCode(resp.StatusCode, http.StatusOK, http.StatusCreated); err != nil {
+		var sec authError
+		err = json.Unmarshal(body, &sec)
+		if err != nil {
+			return err
+		}
+		return sec
+	}
+	return nil
+}
+
+func (u *httpAuthUserAPI) GetUser(ctx context.Context, username string) (*User, error) {
+	return u.modUser(ctx, &authUserAPIAction{
+		verb:     "GET",
+		username: username,
+	})
+}
+
+func (u *httpAuthUserAPI) GrantUser(ctx context.Context, username string, roles []string) (*User, error) {
+	user := &User{
+		User:  username,
+		Grant: roles,
+	}
+	return u.modUser(ctx, &authUserAPIAction{
+		verb:     "PUT",
+		username: username,
+		user:     user,
+	})
+}
+
+func (u *httpAuthUserAPI) RevokeUser(ctx context.Context, username string, roles []string) (*User, error) {
+	user := &User{
+		User:   username,
+		Revoke: roles,
+	}
+	return u.modUser(ctx, &authUserAPIAction{
+		verb:     "PUT",
+		username: username,
+		user:     user,
+	})
+}
+
+func (u *httpAuthUserAPI) ChangePassword(ctx context.Context, username string, password string) (*User, error) {
+	user := &User{
+		User:     username,
+		Password: password,
+	}
+	return u.modUser(ctx, &authUserAPIAction{
+		verb:     "PUT",
+		username: username,
+		user:     user,
+	})
+}
+
+func (u *httpAuthUserAPI) modUser(ctx context.Context, req *authUserAPIAction) (*User, error) {
+	resp, body, err := u.client.Do(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+	if err = assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
+		var sec authError
+		err = json.Unmarshal(body, &sec)
+		if err != nil {
+			return nil, err
+		}
+		return nil, sec
+	}
+	var user User
+	if err = json.Unmarshal(body, &user); err != nil {
+		var userR UserRoles
+		if urerr := json.Unmarshal(body, &userR); urerr != nil {
+			return nil, err
+		}
+		user.User = userR.User
+		for _, r := range userR.Roles {
+			user.Roles = append(user.Roles, r.Role)
+		}
+	}
+	return &user, nil
+}
diff --git a/vendor/go.etcd.io/etcd/client/cancelreq.go b/vendor/go.etcd.io/etcd/client/cancelreq.go
new file mode 100644
index 0000000..76d1f04
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/client/cancelreq.go
@@ -0,0 +1,18 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// borrowed from golang/net/context/ctxhttp/cancelreq.go
+
+package client
+
+import "net/http"
+
+func requestCanceler(tr CancelableTransport, req *http.Request) func() {
+	ch := make(chan struct{})
+	req.Cancel = ch
+
+	return func() {
+		close(ch)
+	}
+}
diff --git a/vendor/go.etcd.io/etcd/client/client.go b/vendor/go.etcd.io/etcd/client/client.go
new file mode 100644
index 0000000..de9ab79
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/client/client.go
@@ -0,0 +1,710 @@
+// Copyright 2015 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"math/rand"
+	"net"
+	"net/http"
+	"net/url"
+	"sort"
+	"strconv"
+	"sync"
+	"time"
+
+	"go.etcd.io/etcd/version"
+)
+
+var (
+	ErrNoEndpoints           = errors.New("client: no endpoints available")
+	ErrTooManyRedirects      = errors.New("client: too many redirects")
+	ErrClusterUnavailable    = errors.New("client: etcd cluster is unavailable or misconfigured")
+	ErrNoLeaderEndpoint      = errors.New("client: no leader endpoint available")
+	errTooManyRedirectChecks = errors.New("client: too many redirect checks")
+
+	// oneShotCtxValue is set on a context using WithValue(&oneShotValue) so
+	// that Do() will not retry a request
+	oneShotCtxValue interface{}
+)
+
+var DefaultRequestTimeout = 5 * time.Second
+
+var DefaultTransport CancelableTransport = &http.Transport{
+	Proxy: http.ProxyFromEnvironment,
+	Dial: (&net.Dialer{
+		Timeout:   30 * time.Second,
+		KeepAlive: 30 * time.Second,
+	}).Dial,
+	TLSHandshakeTimeout: 10 * time.Second,
+}
+
+type EndpointSelectionMode int
+
+const (
+	// EndpointSelectionRandom is the default value of the 'SelectionMode'.
+	// As the name implies, the client object will pick a node from the members
+	// of the cluster in a random fashion. If the cluster has three members, A, B,
+	// and C, the client picks any node from its three members as its request
+	// destination.
+	EndpointSelectionRandom EndpointSelectionMode = iota
+
+	// If 'SelectionMode' is set to 'EndpointSelectionPrioritizeLeader',
+	// requests are sent directly to the cluster leader. This reduces
+	// forwarding roundtrips compared to making requests to etcd followers
+	// who then forward them to the cluster leader. In the event of a leader
+	// failure, however, clients configured this way cannot prioritize among
+	// the remaining etcd followers. Therefore, when a client sets 'SelectionMode'
+	// to 'EndpointSelectionPrioritizeLeader', it must use 'client.AutoSync()' to
+	// maintain its knowledge of current cluster state.
+	//
+	// This mode should be used with Client.AutoSync().
+	EndpointSelectionPrioritizeLeader
+)
+
+type Config struct {
+	// Endpoints defines a set of URLs (schemes, hosts and ports only)
+	// that can be used to communicate with a logical etcd cluster. For
+	// example, a three-node cluster could be provided like so:
+	//
+	// 	Endpoints: []string{
+	//		"http://node1.example.com:2379",
+	//		"http://node2.example.com:2379",
+	//		"http://node3.example.com:2379",
+	//	}
+	//
+	// If multiple endpoints are provided, the Client will attempt to
+	// use them all in the event that one or more of them are unusable.
+	//
+	// If Client.Sync is ever called, the Client may cache an alternate
+	// set of endpoints to continue operation.
+	Endpoints []string
+
+	// Transport is used by the Client to drive HTTP requests. If not
+	// provided, DefaultTransport will be used.
+	Transport CancelableTransport
+
+	// CheckRedirect specifies the policy for handling HTTP redirects.
+	// If CheckRedirect is not nil, the Client calls it before
+	// following an HTTP redirect. The sole argument is the number of
+	// requests that have already been made. If CheckRedirect returns
+	// an error, Client.Do will not make any further requests and return
+	// the error back it to the caller.
+	//
+	// If CheckRedirect is nil, the Client uses its default policy,
+	// which is to stop after 10 consecutive requests.
+	CheckRedirect CheckRedirectFunc
+
+	// Username specifies the user credential to add as an authorization header
+	Username string
+
+	// Password is the password for the specified user to add as an authorization header
+	// to the request.
+	Password string
+
+	// HeaderTimeoutPerRequest specifies the time limit to wait for response
+	// header in a single request made by the Client. The timeout includes
+	// connection time, any redirects, and header wait time.
+	//
+	// For non-watch GET request, server returns the response body immediately.
+	// For PUT/POST/DELETE request, server will attempt to commit request
+	// before responding, which is expected to take `100ms + 2 * RTT`.
+	// For watch request, server returns the header immediately to notify Client
+	// watch start. But if server is behind some kind of proxy, the response
+	// header may be cached at proxy, and Client cannot rely on this behavior.
+	//
+	// Especially, wait request will ignore this timeout.
+	//
+	// One API call may send multiple requests to different etcd servers until it
+	// succeeds. Use context of the API to specify the overall timeout.
+	//
+	// A HeaderTimeoutPerRequest of zero means no timeout.
+	HeaderTimeoutPerRequest time.Duration
+
+	// SelectionMode is an EndpointSelectionMode enum that specifies the
+	// policy for choosing the etcd cluster node to which requests are sent.
+	SelectionMode EndpointSelectionMode
+}
+
+func (cfg *Config) transport() CancelableTransport {
+	if cfg.Transport == nil {
+		return DefaultTransport
+	}
+	return cfg.Transport
+}
+
+func (cfg *Config) checkRedirect() CheckRedirectFunc {
+	if cfg.CheckRedirect == nil {
+		return DefaultCheckRedirect
+	}
+	return cfg.CheckRedirect
+}
+
+// CancelableTransport mimics net/http.Transport, but requires that
+// the object also support request cancellation.
+type CancelableTransport interface {
+	http.RoundTripper
+	CancelRequest(req *http.Request)
+}
+
+type CheckRedirectFunc func(via int) error
+
+// DefaultCheckRedirect follows up to 10 redirects, but no more.
+var DefaultCheckRedirect CheckRedirectFunc = func(via int) error {
+	if via > 10 {
+		return ErrTooManyRedirects
+	}
+	return nil
+}
+
+type Client interface {
+	// Sync updates the internal cache of the etcd cluster's membership.
+	Sync(context.Context) error
+
+	// AutoSync periodically calls Sync() every given interval.
+	// The recommended sync interval is 10 seconds to 1 minute, which does
+	// not bring too much overhead to server and makes client catch up the
+	// cluster change in time.
+	//
+	// The example to use it:
+	//
+	//  for {
+	//      err := client.AutoSync(ctx, 10*time.Second)
+	//      if err == context.DeadlineExceeded || err == context.Canceled {
+	//          break
+	//      }
+	//      log.Print(err)
+	//  }
+	AutoSync(context.Context, time.Duration) error
+
+	// Endpoints returns a copy of the current set of API endpoints used
+	// by Client to resolve HTTP requests. If Sync has ever been called,
+	// this may differ from the initial Endpoints provided in the Config.
+	Endpoints() []string
+
+	// SetEndpoints sets the set of API endpoints used by Client to resolve
+	// HTTP requests. If the given endpoints are not valid, an error will be
+	// returned
+	SetEndpoints(eps []string) error
+
+	// GetVersion retrieves the current etcd server and cluster version
+	GetVersion(ctx context.Context) (*version.Versions, error)
+
+	httpClient
+}
+
+func New(cfg Config) (Client, error) {
+	c := &httpClusterClient{
+		clientFactory: newHTTPClientFactory(cfg.transport(), cfg.checkRedirect(), cfg.HeaderTimeoutPerRequest),
+		rand:          rand.New(rand.NewSource(int64(time.Now().Nanosecond()))),
+		selectionMode: cfg.SelectionMode,
+	}
+	if cfg.Username != "" {
+		c.credentials = &credentials{
+			username: cfg.Username,
+			password: cfg.Password,
+		}
+	}
+	if err := c.SetEndpoints(cfg.Endpoints); err != nil {
+		return nil, err
+	}
+	return c, nil
+}
+
+type httpClient interface {
+	Do(context.Context, httpAction) (*http.Response, []byte, error)
+}
+
+func newHTTPClientFactory(tr CancelableTransport, cr CheckRedirectFunc, headerTimeout time.Duration) httpClientFactory {
+	return func(ep url.URL) httpClient {
+		return &redirectFollowingHTTPClient{
+			checkRedirect: cr,
+			client: &simpleHTTPClient{
+				transport:     tr,
+				endpoint:      ep,
+				headerTimeout: headerTimeout,
+			},
+		}
+	}
+}
+
+type credentials struct {
+	username string
+	password string
+}
+
+type httpClientFactory func(url.URL) httpClient
+
+type httpAction interface {
+	HTTPRequest(url.URL) *http.Request
+}
+
+type httpClusterClient struct {
+	clientFactory httpClientFactory
+	endpoints     []url.URL
+	pinned        int
+	credentials   *credentials
+	sync.RWMutex
+	rand          *rand.Rand
+	selectionMode EndpointSelectionMode
+}
+
+func (c *httpClusterClient) getLeaderEndpoint(ctx context.Context, eps []url.URL) (string, error) {
+	ceps := make([]url.URL, len(eps))
+	copy(ceps, eps)
+
+	// To perform a lookup on the new endpoint list without using the current
+	// client, we'll copy it
+	clientCopy := &httpClusterClient{
+		clientFactory: c.clientFactory,
+		credentials:   c.credentials,
+		rand:          c.rand,
+
+		pinned:    0,
+		endpoints: ceps,
+	}
+
+	mAPI := NewMembersAPI(clientCopy)
+	leader, err := mAPI.Leader(ctx)
+	if err != nil {
+		return "", err
+	}
+	if len(leader.ClientURLs) == 0 {
+		return "", ErrNoLeaderEndpoint
+	}
+
+	return leader.ClientURLs[0], nil // TODO: how to handle multiple client URLs?
+}
+
+func (c *httpClusterClient) parseEndpoints(eps []string) ([]url.URL, error) {
+	if len(eps) == 0 {
+		return []url.URL{}, ErrNoEndpoints
+	}
+
+	neps := make([]url.URL, len(eps))
+	for i, ep := range eps {
+		u, err := url.Parse(ep)
+		if err != nil {
+			return []url.URL{}, err
+		}
+		neps[i] = *u
+	}
+	return neps, nil
+}
+
+func (c *httpClusterClient) SetEndpoints(eps []string) error {
+	neps, err := c.parseEndpoints(eps)
+	if err != nil {
+		return err
+	}
+
+	c.Lock()
+	defer c.Unlock()
+
+	c.endpoints = shuffleEndpoints(c.rand, neps)
+	// We're not doing anything for PrioritizeLeader here. This is
+	// due to not having a context meaning we can't call getLeaderEndpoint
+	// However, if you're using PrioritizeLeader, you've already been told
+	// to regularly call sync, where we do have a ctx, and can figure the
+	// leader. PrioritizeLeader is also quite a loose guarantee, so deal
+	// with it
+	c.pinned = 0
+
+	return nil
+}
+
+func (c *httpClusterClient) Do(ctx context.Context, act httpAction) (*http.Response, []byte, error) {
+	action := act
+	c.RLock()
+	leps := len(c.endpoints)
+	eps := make([]url.URL, leps)
+	n := copy(eps, c.endpoints)
+	pinned := c.pinned
+
+	if c.credentials != nil {
+		action = &authedAction{
+			act:         act,
+			credentials: *c.credentials,
+		}
+	}
+	c.RUnlock()
+
+	if leps == 0 {
+		return nil, nil, ErrNoEndpoints
+	}
+
+	if leps != n {
+		return nil, nil, errors.New("unable to pick endpoint: copy failed")
+	}
+
+	var resp *http.Response
+	var body []byte
+	var err error
+	cerr := &ClusterError{}
+	isOneShot := ctx.Value(&oneShotCtxValue) != nil
+
+	for i := pinned; i < leps+pinned; i++ {
+		k := i % leps
+		hc := c.clientFactory(eps[k])
+		resp, body, err = hc.Do(ctx, action)
+		if err != nil {
+			cerr.Errors = append(cerr.Errors, err)
+			if err == ctx.Err() {
+				return nil, nil, ctx.Err()
+			}
+			if err == context.Canceled || err == context.DeadlineExceeded {
+				return nil, nil, err
+			}
+		} else if resp.StatusCode/100 == 5 {
+			switch resp.StatusCode {
+			case http.StatusInternalServerError, http.StatusServiceUnavailable:
+				// TODO: make sure this is a no leader response
+				cerr.Errors = append(cerr.Errors, fmt.Errorf("client: etcd member %s has no leader", eps[k].String()))
+			default:
+				cerr.Errors = append(cerr.Errors, fmt.Errorf("client: etcd member %s returns server error [%s]", eps[k].String(), http.StatusText(resp.StatusCode)))
+			}
+			err = cerr.Errors[0]
+		}
+		if err != nil {
+			if !isOneShot {
+				continue
+			}
+			c.Lock()
+			c.pinned = (k + 1) % leps
+			c.Unlock()
+			return nil, nil, err
+		}
+		if k != pinned {
+			c.Lock()
+			c.pinned = k
+			c.Unlock()
+		}
+		return resp, body, nil
+	}
+
+	return nil, nil, cerr
+}
+
+func (c *httpClusterClient) Endpoints() []string {
+	c.RLock()
+	defer c.RUnlock()
+
+	eps := make([]string, len(c.endpoints))
+	for i, ep := range c.endpoints {
+		eps[i] = ep.String()
+	}
+
+	return eps
+}
+
+func (c *httpClusterClient) Sync(ctx context.Context) error {
+	mAPI := NewMembersAPI(c)
+	ms, err := mAPI.List(ctx)
+	if err != nil {
+		return err
+	}
+
+	var eps []string
+	for _, m := range ms {
+		eps = append(eps, m.ClientURLs...)
+	}
+
+	neps, err := c.parseEndpoints(eps)
+	if err != nil {
+		return err
+	}
+
+	npin := 0
+
+	switch c.selectionMode {
+	case EndpointSelectionRandom:
+		c.RLock()
+		eq := endpointsEqual(c.endpoints, neps)
+		c.RUnlock()
+
+		if eq {
+			return nil
+		}
+		// When items in the endpoint list changes, we choose a new pin
+		neps = shuffleEndpoints(c.rand, neps)
+	case EndpointSelectionPrioritizeLeader:
+		nle, err := c.getLeaderEndpoint(ctx, neps)
+		if err != nil {
+			return ErrNoLeaderEndpoint
+		}
+
+		for i, n := range neps {
+			if n.String() == nle {
+				npin = i
+				break
+			}
+		}
+	default:
+		return fmt.Errorf("invalid endpoint selection mode: %d", c.selectionMode)
+	}
+
+	c.Lock()
+	defer c.Unlock()
+	c.endpoints = neps
+	c.pinned = npin
+
+	return nil
+}
+
+func (c *httpClusterClient) AutoSync(ctx context.Context, interval time.Duration) error {
+	ticker := time.NewTicker(interval)
+	defer ticker.Stop()
+	for {
+		err := c.Sync(ctx)
+		if err != nil {
+			return err
+		}
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		case <-ticker.C:
+		}
+	}
+}
+
+func (c *httpClusterClient) GetVersion(ctx context.Context) (*version.Versions, error) {
+	act := &getAction{Prefix: "/version"}
+
+	resp, body, err := c.Do(ctx, act)
+	if err != nil {
+		return nil, err
+	}
+
+	switch resp.StatusCode {
+	case http.StatusOK:
+		if len(body) == 0 {
+			return nil, ErrEmptyBody
+		}
+		var vresp version.Versions
+		if err := json.Unmarshal(body, &vresp); err != nil {
+			return nil, ErrInvalidJSON
+		}
+		return &vresp, nil
+	default:
+		var etcdErr Error
+		if err := json.Unmarshal(body, &etcdErr); err != nil {
+			return nil, ErrInvalidJSON
+		}
+		return nil, etcdErr
+	}
+}
+
+type roundTripResponse struct {
+	resp *http.Response
+	err  error
+}
+
+type simpleHTTPClient struct {
+	transport     CancelableTransport
+	endpoint      url.URL
+	headerTimeout time.Duration
+}
+
+func (c *simpleHTTPClient) Do(ctx context.Context, act httpAction) (*http.Response, []byte, error) {
+	req := act.HTTPRequest(c.endpoint)
+
+	if err := printcURL(req); err != nil {
+		return nil, nil, err
+	}
+
+	isWait := false
+	if req != nil && req.URL != nil {
+		ws := req.URL.Query().Get("wait")
+		if len(ws) != 0 {
+			var err error
+			isWait, err = strconv.ParseBool(ws)
+			if err != nil {
+				return nil, nil, fmt.Errorf("wrong wait value %s (%v for %+v)", ws, err, req)
+			}
+		}
+	}
+
+	var hctx context.Context
+	var hcancel context.CancelFunc
+	if !isWait && c.headerTimeout > 0 {
+		hctx, hcancel = context.WithTimeout(ctx, c.headerTimeout)
+	} else {
+		hctx, hcancel = context.WithCancel(ctx)
+	}
+	defer hcancel()
+
+	reqcancel := requestCanceler(c.transport, req)
+
+	rtchan := make(chan roundTripResponse, 1)
+	go func() {
+		resp, err := c.transport.RoundTrip(req)
+		rtchan <- roundTripResponse{resp: resp, err: err}
+		close(rtchan)
+	}()
+
+	var resp *http.Response
+	var err error
+
+	select {
+	case rtresp := <-rtchan:
+		resp, err = rtresp.resp, rtresp.err
+	case <-hctx.Done():
+		// cancel and wait for request to actually exit before continuing
+		reqcancel()
+		rtresp := <-rtchan
+		resp = rtresp.resp
+		switch {
+		case ctx.Err() != nil:
+			err = ctx.Err()
+		case hctx.Err() != nil:
+			err = fmt.Errorf("client: endpoint %s exceeded header timeout", c.endpoint.String())
+		default:
+			panic("failed to get error from context")
+		}
+	}
+
+	// always check for resp nil-ness to deal with possible
+	// race conditions between channels above
+	defer func() {
+		if resp != nil {
+			resp.Body.Close()
+		}
+	}()
+
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var body []byte
+	done := make(chan struct{})
+	go func() {
+		body, err = ioutil.ReadAll(resp.Body)
+		done <- struct{}{}
+	}()
+
+	select {
+	case <-ctx.Done():
+		resp.Body.Close()
+		<-done
+		return nil, nil, ctx.Err()
+	case <-done:
+	}
+
+	return resp, body, err
+}
+
+type authedAction struct {
+	act         httpAction
+	credentials credentials
+}
+
+func (a *authedAction) HTTPRequest(url url.URL) *http.Request {
+	r := a.act.HTTPRequest(url)
+	r.SetBasicAuth(a.credentials.username, a.credentials.password)
+	return r
+}
+
+type redirectFollowingHTTPClient struct {
+	client        httpClient
+	checkRedirect CheckRedirectFunc
+}
+
+func (r *redirectFollowingHTTPClient) Do(ctx context.Context, act httpAction) (*http.Response, []byte, error) {
+	next := act
+	for i := 0; i < 100; i++ {
+		if i > 0 {
+			if err := r.checkRedirect(i); err != nil {
+				return nil, nil, err
+			}
+		}
+		resp, body, err := r.client.Do(ctx, next)
+		if err != nil {
+			return nil, nil, err
+		}
+		if resp.StatusCode/100 == 3 {
+			hdr := resp.Header.Get("Location")
+			if hdr == "" {
+				return nil, nil, fmt.Errorf("location header not set")
+			}
+			loc, err := url.Parse(hdr)
+			if err != nil {
+				return nil, nil, fmt.Errorf("location header not valid URL: %s", hdr)
+			}
+			next = &redirectedHTTPAction{
+				action:   act,
+				location: *loc,
+			}
+			continue
+		}
+		return resp, body, nil
+	}
+
+	return nil, nil, errTooManyRedirectChecks
+}
+
+type redirectedHTTPAction struct {
+	action   httpAction
+	location url.URL
+}
+
+func (r *redirectedHTTPAction) HTTPRequest(ep url.URL) *http.Request {
+	orig := r.action.HTTPRequest(ep)
+	orig.URL = &r.location
+	return orig
+}
+
+func shuffleEndpoints(r *rand.Rand, eps []url.URL) []url.URL {
+	// copied from Go 1.9<= rand.Rand.Perm
+	n := len(eps)
+	p := make([]int, n)
+	for i := 0; i < n; i++ {
+		j := r.Intn(i + 1)
+		p[i] = p[j]
+		p[j] = i
+	}
+	neps := make([]url.URL, n)
+	for i, k := range p {
+		neps[i] = eps[k]
+	}
+	return neps
+}
+
+func endpointsEqual(left, right []url.URL) bool {
+	if len(left) != len(right) {
+		return false
+	}
+
+	sLeft := make([]string, len(left))
+	sRight := make([]string, len(right))
+	for i, l := range left {
+		sLeft[i] = l.String()
+	}
+	for i, r := range right {
+		sRight[i] = r.String()
+	}
+
+	sort.Strings(sLeft)
+	sort.Strings(sRight)
+	for i := range sLeft {
+		if sLeft[i] != sRight[i] {
+			return false
+		}
+	}
+	return true
+}
diff --git a/vendor/go.etcd.io/etcd/client/cluster_error.go b/vendor/go.etcd.io/etcd/client/cluster_error.go
new file mode 100644
index 0000000..34618cd
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/client/cluster_error.go
@@ -0,0 +1,37 @@
+// Copyright 2015 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+import "fmt"
+
+type ClusterError struct {
+	Errors []error
+}
+
+func (ce *ClusterError) Error() string {
+	s := ErrClusterUnavailable.Error()
+	for i, e := range ce.Errors {
+		s += fmt.Sprintf("; error #%d: %s\n", i, e)
+	}
+	return s
+}
+
+func (ce *ClusterError) Detail() string {
+	s := ""
+	for i, e := range ce.Errors {
+		s += fmt.Sprintf("error #%d: %s\n", i, e)
+	}
+	return s
+}
diff --git a/vendor/go.etcd.io/etcd/client/curl.go b/vendor/go.etcd.io/etcd/client/curl.go
new file mode 100644
index 0000000..c8bc9fb
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/client/curl.go
@@ -0,0 +1,70 @@
+// Copyright 2015 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"os"
+)
+
+var (
+	cURLDebug = false
+)
+
+func EnablecURLDebug() {
+	cURLDebug = true
+}
+
+func DisablecURLDebug() {
+	cURLDebug = false
+}
+
+// printcURL prints the cURL equivalent request to stderr.
+// It returns an error if the body of the request cannot
+// be read.
+// The caller MUST cancel the request if there is an error.
+func printcURL(req *http.Request) error {
+	if !cURLDebug {
+		return nil
+	}
+	var (
+		command string
+		b       []byte
+		err     error
+	)
+
+	if req.URL != nil {
+		command = fmt.Sprintf("curl -X %s %s", req.Method, req.URL.String())
+	}
+
+	if req.Body != nil {
+		b, err = ioutil.ReadAll(req.Body)
+		if err != nil {
+			return err
+		}
+		command += fmt.Sprintf(" -d %q", string(b))
+	}
+
+	fmt.Fprintf(os.Stderr, "cURL Command: %s\n", command)
+
+	// reset body
+	body := bytes.NewBuffer(b)
+	req.Body = ioutil.NopCloser(body)
+
+	return nil
+}
diff --git a/vendor/go.etcd.io/etcd/client/discover.go b/vendor/go.etcd.io/etcd/client/discover.go
new file mode 100644
index 0000000..580c256
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/client/discover.go
@@ -0,0 +1,40 @@
+// Copyright 2015 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+import (
+	"go.etcd.io/etcd/pkg/srv"
+)
+
+// Discoverer is an interface that wraps the Discover method.
+type Discoverer interface {
+	// Discover looks up the etcd servers for the domain.
+	Discover(domain string, serviceName string) ([]string, error)
+}
+
+type srvDiscover struct{}
+
+// NewSRVDiscover constructs a new Discoverer that uses the stdlib to lookup SRV records.
+func NewSRVDiscover() Discoverer {
+	return &srvDiscover{}
+}
+
+func (d *srvDiscover) Discover(domain string, serviceName string) ([]string, error) {
+	srvs, err := srv.GetClient("etcd-client", domain, serviceName)
+	if err != nil {
+		return nil, err
+	}
+	return srvs.Endpoints, nil
+}
diff --git a/vendor/go.etcd.io/etcd/client/doc.go b/vendor/go.etcd.io/etcd/client/doc.go
new file mode 100644
index 0000000..abe5199
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/client/doc.go
@@ -0,0 +1,73 @@
+// Copyright 2015 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/*
+Package client provides bindings for the etcd APIs.
+
+Create a Config and exchange it for a Client:
+
+	import (
+		"net/http"
+		"context"
+
+		"go.etcd.io/etcd/client"
+	)
+
+	cfg := client.Config{
+		Endpoints: []string{"http://127.0.0.1:2379"},
+		Transport: DefaultTransport,
+	}
+
+	c, err := client.New(cfg)
+	if err != nil {
+		// handle error
+	}
+
+Clients are safe for concurrent use by multiple goroutines.
+
+Create a KeysAPI using the Client, then use it to interact with etcd:
+
+	kAPI := client.NewKeysAPI(c)
+
+	// create a new key /foo with the value "bar"
+	_, err = kAPI.Create(context.Background(), "/foo", "bar")
+	if err != nil {
+		// handle error
+	}
+
+	// delete the newly created key only if the value is still "bar"
+	_, err = kAPI.Delete(context.Background(), "/foo", &DeleteOptions{PrevValue: "bar"})
+	if err != nil {
+		// handle error
+	}
+
+Use a custom context to set timeouts on your operations:
+
+	import "time"
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	// set a new key, ignoring its previous state
+	_, err := kAPI.Set(ctx, "/ping", "pong", nil)
+	if err != nil {
+		if err == context.DeadlineExceeded {
+			// request took longer than 5s
+		} else {
+			// handle error
+		}
+	}
+
+*/
+package client
diff --git a/vendor/go.etcd.io/etcd/client/json.go b/vendor/go.etcd.io/etcd/client/json.go
new file mode 100644
index 0000000..97cdbcd
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/client/json.go
@@ -0,0 +1,72 @@
+// Copyright 2019 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+import (
+	"github.com/json-iterator/go"
+	"github.com/modern-go/reflect2"
+	"strconv"
+	"unsafe"
+)
+
+type customNumberExtension struct {
+	jsoniter.DummyExtension
+}
+
+func (cne *customNumberExtension) CreateDecoder(typ reflect2.Type) jsoniter.ValDecoder {
+	if typ.String() == "interface {}" {
+		return customNumberDecoder{}
+	}
+	return nil
+}
+
+type customNumberDecoder struct {
+}
+
+func (customNumberDecoder) Decode(ptr unsafe.Pointer, iter *jsoniter.Iterator) {
+	switch iter.WhatIsNext() {
+	case jsoniter.NumberValue:
+		var number jsoniter.Number
+		iter.ReadVal(&number)
+		i64, err := strconv.ParseInt(string(number), 10, 64)
+		if err == nil {
+			*(*interface{})(ptr) = i64
+			return
+		}
+		f64, err := strconv.ParseFloat(string(number), 64)
+		if err == nil {
+			*(*interface{})(ptr) = f64
+			return
+		}
+		iter.ReportError("DecodeNumber", err.Error())
+	default:
+		*(*interface{})(ptr) = iter.Read()
+	}
+}
+
+// caseSensitiveJsonIterator returns a jsoniterator API that's configured to be
+// case-sensitive when unmarshalling, and otherwise compatible with
+// the encoding/json standard library.
+func caseSensitiveJsonIterator() jsoniter.API {
+	config := jsoniter.Config{
+		EscapeHTML:             true,
+		SortMapKeys:            true,
+		ValidateJsonRawMessage: true,
+		CaseSensitive:          true,
+	}.Froze()
+	// Force jsoniter to decode number to interface{} via int64/float64, if possible.
+	config.RegisterExtension(&customNumberExtension{})
+	return config
+}
diff --git a/vendor/go.etcd.io/etcd/client/keys.go b/vendor/go.etcd.io/etcd/client/keys.go
new file mode 100644
index 0000000..ec53830
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/client/keys.go
@@ -0,0 +1,679 @@
+// Copyright 2015 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"go.etcd.io/etcd/pkg/pathutil"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const (
+	ErrorCodeKeyNotFound  = 100
+	ErrorCodeTestFailed   = 101
+	ErrorCodeNotFile      = 102
+	ErrorCodeNotDir       = 104
+	ErrorCodeNodeExist    = 105
+	ErrorCodeRootROnly    = 107
+	ErrorCodeDirNotEmpty  = 108
+	ErrorCodeUnauthorized = 110
+
+	ErrorCodePrevValueRequired = 201
+	ErrorCodeTTLNaN            = 202
+	ErrorCodeIndexNaN          = 203
+	ErrorCodeInvalidField      = 209
+	ErrorCodeInvalidForm       = 210
+
+	ErrorCodeRaftInternal = 300
+	ErrorCodeLeaderElect  = 301
+
+	ErrorCodeWatcherCleared    = 400
+	ErrorCodeEventIndexCleared = 401
+)
+
+type Error struct {
+	Code    int    `json:"errorCode"`
+	Message string `json:"message"`
+	Cause   string `json:"cause"`
+	Index   uint64 `json:"index"`
+}
+
+func (e Error) Error() string {
+	return fmt.Sprintf("%v: %v (%v) [%v]", e.Code, e.Message, e.Cause, e.Index)
+}
+
+var (
+	ErrInvalidJSON = errors.New("client: response is invalid json. The endpoint is probably not valid etcd cluster endpoint")
+	ErrEmptyBody   = errors.New("client: response body is empty")
+)
+
+// PrevExistType is used to define an existence condition when setting
+// or deleting Nodes.
+type PrevExistType string
+
+const (
+	PrevIgnore  = PrevExistType("")
+	PrevExist   = PrevExistType("true")
+	PrevNoExist = PrevExistType("false")
+)
+
+var (
+	defaultV2KeysPrefix = "/v2/keys"
+)
+
+// NewKeysAPI builds a KeysAPI that interacts with etcd's key-value
+// API over HTTP.
+func NewKeysAPI(c Client) KeysAPI {
+	return NewKeysAPIWithPrefix(c, defaultV2KeysPrefix)
+}
+
+// NewKeysAPIWithPrefix acts like NewKeysAPI, but allows the caller
+// to provide a custom base URL path. This should only be used in
+// very rare cases.
+func NewKeysAPIWithPrefix(c Client, p string) KeysAPI {
+	return &httpKeysAPI{
+		client: c,
+		prefix: p,
+	}
+}
+
+type KeysAPI interface {
+	// Get retrieves a set of Nodes from etcd
+	Get(ctx context.Context, key string, opts *GetOptions) (*Response, error)
+
+	// Set assigns a new value to a Node identified by a given key. The caller
+	// may define a set of conditions in the SetOptions. If SetOptions.Dir=true
+	// then value is ignored.
+	Set(ctx context.Context, key, value string, opts *SetOptions) (*Response, error)
+
+	// Delete removes a Node identified by the given key, optionally destroying
+	// all of its children as well. The caller may define a set of required
+	// conditions in an DeleteOptions object.
+	Delete(ctx context.Context, key string, opts *DeleteOptions) (*Response, error)
+
+	// Create is an alias for Set w/ PrevExist=false
+	Create(ctx context.Context, key, value string) (*Response, error)
+
+	// CreateInOrder is used to atomically create in-order keys within the given directory.
+	CreateInOrder(ctx context.Context, dir, value string, opts *CreateInOrderOptions) (*Response, error)
+
+	// Update is an alias for Set w/ PrevExist=true
+	Update(ctx context.Context, key, value string) (*Response, error)
+
+	// Watcher builds a new Watcher targeted at a specific Node identified
+	// by the given key. The Watcher may be configured at creation time
+	// through a WatcherOptions object. The returned Watcher is designed
+	// to emit events that happen to a Node, and optionally to its children.
+	Watcher(key string, opts *WatcherOptions) Watcher
+}
+
+type WatcherOptions struct {
+	// AfterIndex defines the index after-which the Watcher should
+	// start emitting events. For example, if a value of 5 is
+	// provided, the first event will have an index >= 6.
+	//
+	// Setting AfterIndex to 0 (default) means that the Watcher
+	// should start watching for events starting at the current
+	// index, whatever that may be.
+	AfterIndex uint64
+
+	// Recursive specifies whether or not the Watcher should emit
+	// events that occur in children of the given keyspace. If set
+	// to false (default), events will be limited to those that
+	// occur for the exact key.
+	Recursive bool
+}
+
+type CreateInOrderOptions struct {
+	// TTL defines a period of time after-which the Node should
+	// expire and no longer exist. Values <= 0 are ignored. Given
+	// that the zero-value is ignored, TTL cannot be used to set
+	// a TTL of 0.
+	TTL time.Duration
+}
+
+type SetOptions struct {
+	// PrevValue specifies what the current value of the Node must
+	// be in order for the Set operation to succeed.
+	//
+	// Leaving this field empty means that the caller wishes to
+	// ignore the current value of the Node. This cannot be used
+	// to compare the Node's current value to an empty string.
+	//
+	// PrevValue is ignored if Dir=true
+	PrevValue string
+
+	// PrevIndex indicates what the current ModifiedIndex of the
+	// Node must be in order for the Set operation to succeed.
+	//
+	// If PrevIndex is set to 0 (default), no comparison is made.
+	PrevIndex uint64
+
+	// PrevExist specifies whether the Node must currently exist
+	// (PrevExist) or not (PrevNoExist). If the caller does not
+	// care about existence, set PrevExist to PrevIgnore, or simply
+	// leave it unset.
+	PrevExist PrevExistType
+
+	// TTL defines a period of time after-which the Node should
+	// expire and no longer exist. Values <= 0 are ignored. Given
+	// that the zero-value is ignored, TTL cannot be used to set
+	// a TTL of 0.
+	TTL time.Duration
+
+	// Refresh set to true means a TTL value can be updated
+	// without firing a watch or changing the node value. A
+	// value must not be provided when refreshing a key.
+	Refresh bool
+
+	// Dir specifies whether or not this Node should be created as a directory.
+	Dir bool
+
+	// NoValueOnSuccess specifies whether the response contains the current value of the Node.
+	// If set, the response will only contain the current value when the request fails.
+	NoValueOnSuccess bool
+}
+
+type GetOptions struct {
+	// Recursive defines whether or not all children of the Node
+	// should be returned.
+	Recursive bool
+
+	// Sort instructs the server whether or not to sort the Nodes.
+	// If true, the Nodes are sorted alphabetically by key in
+	// ascending order (A to z). If false (default), the Nodes will
+	// not be sorted and the ordering used should not be considered
+	// predictable.
+	Sort bool
+
+	// Quorum specifies whether it gets the latest committed value that
+	// has been applied in quorum of members, which ensures external
+	// consistency (or linearizability).
+	Quorum bool
+}
+
+type DeleteOptions struct {
+	// PrevValue specifies what the current value of the Node must
+	// be in order for the Delete operation to succeed.
+	//
+	// Leaving this field empty means that the caller wishes to
+	// ignore the current value of the Node. This cannot be used
+	// to compare the Node's current value to an empty string.
+	PrevValue string
+
+	// PrevIndex indicates what the current ModifiedIndex of the
+	// Node must be in order for the Delete operation to succeed.
+	//
+	// If PrevIndex is set to 0 (default), no comparison is made.
+	PrevIndex uint64
+
+	// Recursive defines whether or not all children of the Node
+	// should be deleted. If set to true, all children of the Node
+	// identified by the given key will be deleted. If left unset
+	// or explicitly set to false, only a single Node will be
+	// deleted.
+	Recursive bool
+
+	// Dir specifies whether or not this Node should be removed as a directory.
+	Dir bool
+}
+
+type Watcher interface {
+	// Next blocks until an etcd event occurs, then returns a Response
+	// representing that event. The behavior of Next depends on the
+	// WatcherOptions used to construct the Watcher. Next is designed to
+	// be called repeatedly, each time blocking until a subsequent event
+	// is available.
+	//
+	// If the provided context is cancelled, Next will return a non-nil
+	// error. Any other failures encountered while waiting for the next
+	// event (connection issues, deserialization failures, etc) will
+	// also result in a non-nil error.
+	Next(context.Context) (*Response, error)
+}
+
+type Response struct {
+	// Action is the name of the operation that occurred. Possible values
+	// include get, set, delete, update, create, compareAndSwap,
+	// compareAndDelete and expire.
+	Action string `json:"action"`
+
+	// Node represents the state of the relevant etcd Node.
+	Node *Node `json:"node"`
+
+	// PrevNode represents the previous state of the Node. PrevNode is non-nil
+	// only if the Node existed before the action occurred and the action
+	// caused a change to the Node.
+	PrevNode *Node `json:"prevNode"`
+
+	// Index holds the cluster-level index at the time the Response was generated.
+	// This index is not tied to the Node(s) contained in this Response.
+	Index uint64 `json:"-"`
+
+	// ClusterID holds the cluster-level ID reported by the server.  This
+	// should be different for different etcd clusters.
+	ClusterID string `json:"-"`
+}
+
+type Node struct {
+	// Key represents the unique location of this Node (e.g. "/foo/bar").
+	Key string `json:"key"`
+
+	// Dir reports whether node describes a directory.
+	Dir bool `json:"dir,omitempty"`
+
+	// Value is the current data stored on this Node. If this Node
+	// is a directory, Value will be empty.
+	Value string `json:"value"`
+
+	// Nodes holds the children of this Node, only if this Node is a directory.
+	// This slice of will be arbitrarily deep (children, grandchildren, great-
+	// grandchildren, etc.) if a recursive Get or Watch request were made.
+	Nodes Nodes `json:"nodes"`
+
+	// CreatedIndex is the etcd index at-which this Node was created.
+	CreatedIndex uint64 `json:"createdIndex"`
+
+	// ModifiedIndex is the etcd index at-which this Node was last modified.
+	ModifiedIndex uint64 `json:"modifiedIndex"`
+
+	// Expiration is the server side expiration time of the key.
+	Expiration *time.Time `json:"expiration,omitempty"`
+
+	// TTL is the time to live of the key in second.
+	TTL int64 `json:"ttl,omitempty"`
+}
+
+func (n *Node) String() string {
+	return fmt.Sprintf("{Key: %s, CreatedIndex: %d, ModifiedIndex: %d, TTL: %d}", n.Key, n.CreatedIndex, n.ModifiedIndex, n.TTL)
+}
+
+// TTLDuration returns the Node's TTL as a time.Duration object
+func (n *Node) TTLDuration() time.Duration {
+	return time.Duration(n.TTL) * time.Second
+}
+
+type Nodes []*Node
+
+// interfaces for sorting
+
+func (ns Nodes) Len() int           { return len(ns) }
+func (ns Nodes) Less(i, j int) bool { return ns[i].Key < ns[j].Key }
+func (ns Nodes) Swap(i, j int)      { ns[i], ns[j] = ns[j], ns[i] }
+
+type httpKeysAPI struct {
+	client httpClient
+	prefix string
+}
+
+func (k *httpKeysAPI) Set(ctx context.Context, key, val string, opts *SetOptions) (*Response, error) {
+	act := &setAction{
+		Prefix: k.prefix,
+		Key:    key,
+		Value:  val,
+	}
+
+	if opts != nil {
+		act.PrevValue = opts.PrevValue
+		act.PrevIndex = opts.PrevIndex
+		act.PrevExist = opts.PrevExist
+		act.TTL = opts.TTL
+		act.Refresh = opts.Refresh
+		act.Dir = opts.Dir
+		act.NoValueOnSuccess = opts.NoValueOnSuccess
+	}
+
+	doCtx := ctx
+	if act.PrevExist == PrevNoExist {
+		doCtx = context.WithValue(doCtx, &oneShotCtxValue, &oneShotCtxValue)
+	}
+	resp, body, err := k.client.Do(doCtx, act)
+	if err != nil {
+		return nil, err
+	}
+
+	return unmarshalHTTPResponse(resp.StatusCode, resp.Header, body)
+}
+
+func (k *httpKeysAPI) Create(ctx context.Context, key, val string) (*Response, error) {
+	return k.Set(ctx, key, val, &SetOptions{PrevExist: PrevNoExist})
+}
+
+func (k *httpKeysAPI) CreateInOrder(ctx context.Context, dir, val string, opts *CreateInOrderOptions) (*Response, error) {
+	act := &createInOrderAction{
+		Prefix: k.prefix,
+		Dir:    dir,
+		Value:  val,
+	}
+
+	if opts != nil {
+		act.TTL = opts.TTL
+	}
+
+	resp, body, err := k.client.Do(ctx, act)
+	if err != nil {
+		return nil, err
+	}
+
+	return unmarshalHTTPResponse(resp.StatusCode, resp.Header, body)
+}
+
+func (k *httpKeysAPI) Update(ctx context.Context, key, val string) (*Response, error) {
+	return k.Set(ctx, key, val, &SetOptions{PrevExist: PrevExist})
+}
+
+func (k *httpKeysAPI) Delete(ctx context.Context, key string, opts *DeleteOptions) (*Response, error) {
+	act := &deleteAction{
+		Prefix: k.prefix,
+		Key:    key,
+	}
+
+	if opts != nil {
+		act.PrevValue = opts.PrevValue
+		act.PrevIndex = opts.PrevIndex
+		act.Dir = opts.Dir
+		act.Recursive = opts.Recursive
+	}
+
+	doCtx := context.WithValue(ctx, &oneShotCtxValue, &oneShotCtxValue)
+	resp, body, err := k.client.Do(doCtx, act)
+	if err != nil {
+		return nil, err
+	}
+
+	return unmarshalHTTPResponse(resp.StatusCode, resp.Header, body)
+}
+
+func (k *httpKeysAPI) Get(ctx context.Context, key string, opts *GetOptions) (*Response, error) {
+	act := &getAction{
+		Prefix: k.prefix,
+		Key:    key,
+	}
+
+	if opts != nil {
+		act.Recursive = opts.Recursive
+		act.Sorted = opts.Sort
+		act.Quorum = opts.Quorum
+	}
+
+	resp, body, err := k.client.Do(ctx, act)
+	if err != nil {
+		return nil, err
+	}
+
+	return unmarshalHTTPResponse(resp.StatusCode, resp.Header, body)
+}
+
+func (k *httpKeysAPI) Watcher(key string, opts *WatcherOptions) Watcher {
+	act := waitAction{
+		Prefix: k.prefix,
+		Key:    key,
+	}
+
+	if opts != nil {
+		act.Recursive = opts.Recursive
+		if opts.AfterIndex > 0 {
+			act.WaitIndex = opts.AfterIndex + 1
+		}
+	}
+
+	return &httpWatcher{
+		client:   k.client,
+		nextWait: act,
+	}
+}
+
+type httpWatcher struct {
+	client   httpClient
+	nextWait waitAction
+}
+
+func (hw *httpWatcher) Next(ctx context.Context) (*Response, error) {
+	for {
+		httpresp, body, err := hw.client.Do(ctx, &hw.nextWait)
+		if err != nil {
+			return nil, err
+		}
+
+		resp, err := unmarshalHTTPResponse(httpresp.StatusCode, httpresp.Header, body)
+		if err != nil {
+			if err == ErrEmptyBody {
+				continue
+			}
+			return nil, err
+		}
+
+		hw.nextWait.WaitIndex = resp.Node.ModifiedIndex + 1
+		return resp, nil
+	}
+}
+
+// v2KeysURL forms a URL representing the location of a key.
+// The endpoint argument represents the base URL of an etcd
+// server. The prefix is the path needed to route from the
+// provided endpoint's path to the root of the keys API
+// (typically "/v2/keys").
+func v2KeysURL(ep url.URL, prefix, key string) *url.URL {
+	// We concatenate all parts together manually. We cannot use
+	// path.Join because it does not reserve trailing slash.
+	// We call CanonicalURLPath to further cleanup the path.
+	if prefix != "" && prefix[0] != '/' {
+		prefix = "/" + prefix
+	}
+	if key != "" && key[0] != '/' {
+		key = "/" + key
+	}
+	ep.Path = pathutil.CanonicalURLPath(ep.Path + prefix + key)
+	return &ep
+}
+
+type getAction struct {
+	Prefix    string
+	Key       string
+	Recursive bool
+	Sorted    bool
+	Quorum    bool
+}
+
+func (g *getAction) HTTPRequest(ep url.URL) *http.Request {
+	u := v2KeysURL(ep, g.Prefix, g.Key)
+
+	params := u.Query()
+	params.Set("recursive", strconv.FormatBool(g.Recursive))
+	params.Set("sorted", strconv.FormatBool(g.Sorted))
+	params.Set("quorum", strconv.FormatBool(g.Quorum))
+	u.RawQuery = params.Encode()
+
+	req, _ := http.NewRequest("GET", u.String(), nil)
+	return req
+}
+
+type waitAction struct {
+	Prefix    string
+	Key       string
+	WaitIndex uint64
+	Recursive bool
+}
+
+func (w *waitAction) HTTPRequest(ep url.URL) *http.Request {
+	u := v2KeysURL(ep, w.Prefix, w.Key)
+
+	params := u.Query()
+	params.Set("wait", "true")
+	params.Set("waitIndex", strconv.FormatUint(w.WaitIndex, 10))
+	params.Set("recursive", strconv.FormatBool(w.Recursive))
+	u.RawQuery = params.Encode()
+
+	req, _ := http.NewRequest("GET", u.String(), nil)
+	return req
+}
+
+type setAction struct {
+	Prefix           string
+	Key              string
+	Value            string
+	PrevValue        string
+	PrevIndex        uint64
+	PrevExist        PrevExistType
+	TTL              time.Duration
+	Refresh          bool
+	Dir              bool
+	NoValueOnSuccess bool
+}
+
+func (a *setAction) HTTPRequest(ep url.URL) *http.Request {
+	u := v2KeysURL(ep, a.Prefix, a.Key)
+
+	params := u.Query()
+	form := url.Values{}
+
+	// we're either creating a directory or setting a key
+	if a.Dir {
+		params.Set("dir", strconv.FormatBool(a.Dir))
+	} else {
+		// These options are only valid for setting a key
+		if a.PrevValue != "" {
+			params.Set("prevValue", a.PrevValue)
+		}
+		form.Add("value", a.Value)
+	}
+
+	// Options which apply to both setting a key and creating a dir
+	if a.PrevIndex != 0 {
+		params.Set("prevIndex", strconv.FormatUint(a.PrevIndex, 10))
+	}
+	if a.PrevExist != PrevIgnore {
+		params.Set("prevExist", string(a.PrevExist))
+	}
+	if a.TTL > 0 {
+		form.Add("ttl", strconv.FormatUint(uint64(a.TTL.Seconds()), 10))
+	}
+
+	if a.Refresh {
+		form.Add("refresh", "true")
+	}
+	if a.NoValueOnSuccess {
+		params.Set("noValueOnSuccess", strconv.FormatBool(a.NoValueOnSuccess))
+	}
+
+	u.RawQuery = params.Encode()
+	body := strings.NewReader(form.Encode())
+
+	req, _ := http.NewRequest("PUT", u.String(), body)
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+
+	return req
+}
+
+type deleteAction struct {
+	Prefix    string
+	Key       string
+	PrevValue string
+	PrevIndex uint64
+	Dir       bool
+	Recursive bool
+}
+
+func (a *deleteAction) HTTPRequest(ep url.URL) *http.Request {
+	u := v2KeysURL(ep, a.Prefix, a.Key)
+
+	params := u.Query()
+	if a.PrevValue != "" {
+		params.Set("prevValue", a.PrevValue)
+	}
+	if a.PrevIndex != 0 {
+		params.Set("prevIndex", strconv.FormatUint(a.PrevIndex, 10))
+	}
+	if a.Dir {
+		params.Set("dir", "true")
+	}
+	if a.Recursive {
+		params.Set("recursive", "true")
+	}
+	u.RawQuery = params.Encode()
+
+	req, _ := http.NewRequest("DELETE", u.String(), nil)
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+
+	return req
+}
+
+type createInOrderAction struct {
+	Prefix string
+	Dir    string
+	Value  string
+	TTL    time.Duration
+}
+
+func (a *createInOrderAction) HTTPRequest(ep url.URL) *http.Request {
+	u := v2KeysURL(ep, a.Prefix, a.Dir)
+
+	form := url.Values{}
+	form.Add("value", a.Value)
+	if a.TTL > 0 {
+		form.Add("ttl", strconv.FormatUint(uint64(a.TTL.Seconds()), 10))
+	}
+	body := strings.NewReader(form.Encode())
+
+	req, _ := http.NewRequest("POST", u.String(), body)
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	return req
+}
+
+func unmarshalHTTPResponse(code int, header http.Header, body []byte) (res *Response, err error) {
+	switch code {
+	case http.StatusOK, http.StatusCreated:
+		if len(body) == 0 {
+			return nil, ErrEmptyBody
+		}
+		res, err = unmarshalSuccessfulKeysResponse(header, body)
+	default:
+		err = unmarshalFailedKeysResponse(body)
+	}
+	return res, err
+}
+
+var jsonIterator = caseSensitiveJsonIterator()
+
+func unmarshalSuccessfulKeysResponse(header http.Header, body []byte) (*Response, error) {
+	var res Response
+	err := jsonIterator.Unmarshal(body, &res)
+	if err != nil {
+		return nil, ErrInvalidJSON
+	}
+	if header.Get("X-Etcd-Index") != "" {
+		res.Index, err = strconv.ParseUint(header.Get("X-Etcd-Index"), 10, 64)
+		if err != nil {
+			return nil, err
+		}
+	}
+	res.ClusterID = header.Get("X-Etcd-Cluster-ID")
+	return &res, nil
+}
+
+func unmarshalFailedKeysResponse(body []byte) error {
+	var etcdErr Error
+	if err := json.Unmarshal(body, &etcdErr); err != nil {
+		return ErrInvalidJSON
+	}
+	return etcdErr
+}
diff --git a/vendor/go.etcd.io/etcd/client/members.go b/vendor/go.etcd.io/etcd/client/members.go
new file mode 100644
index 0000000..657131a
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/client/members.go
@@ -0,0 +1,303 @@
+// Copyright 2015 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+	"path"
+
+	"go.etcd.io/etcd/pkg/types"
+)
+
+var (
+	defaultV2MembersPrefix = "/v2/members"
+	defaultLeaderSuffix    = "/leader"
+)
+
+type Member struct {
+	// ID is the unique identifier of this Member.
+	ID string `json:"id"`
+
+	// Name is a human-readable, non-unique identifier of this Member.
+	Name string `json:"name"`
+
+	// PeerURLs represents the HTTP(S) endpoints this Member uses to
+	// participate in etcd's consensus protocol.
+	PeerURLs []string `json:"peerURLs"`
+
+	// ClientURLs represents the HTTP(S) endpoints on which this Member
+	// serves its client-facing APIs.
+	ClientURLs []string `json:"clientURLs"`
+}
+
+type memberCollection []Member
+
+func (c *memberCollection) UnmarshalJSON(data []byte) error {
+	d := struct {
+		Members []Member
+	}{}
+
+	if err := json.Unmarshal(data, &d); err != nil {
+		return err
+	}
+
+	if d.Members == nil {
+		*c = make([]Member, 0)
+		return nil
+	}
+
+	*c = d.Members
+	return nil
+}
+
+type memberCreateOrUpdateRequest struct {
+	PeerURLs types.URLs
+}
+
+func (m *memberCreateOrUpdateRequest) MarshalJSON() ([]byte, error) {
+	s := struct {
+		PeerURLs []string `json:"peerURLs"`
+	}{
+		PeerURLs: make([]string, len(m.PeerURLs)),
+	}
+
+	for i, u := range m.PeerURLs {
+		s.PeerURLs[i] = u.String()
+	}
+
+	return json.Marshal(&s)
+}
+
+// NewMembersAPI constructs a new MembersAPI that uses HTTP to
+// interact with etcd's membership API.
+func NewMembersAPI(c Client) MembersAPI {
+	return &httpMembersAPI{
+		client: c,
+	}
+}
+
+type MembersAPI interface {
+	// List enumerates the current cluster membership.
+	List(ctx context.Context) ([]Member, error)
+
+	// Add instructs etcd to accept a new Member into the cluster.
+	Add(ctx context.Context, peerURL string) (*Member, error)
+
+	// Remove demotes an existing Member out of the cluster.
+	Remove(ctx context.Context, mID string) error
+
+	// Update instructs etcd to update an existing Member in the cluster.
+	Update(ctx context.Context, mID string, peerURLs []string) error
+
+	// Leader gets current leader of the cluster
+	Leader(ctx context.Context) (*Member, error)
+}
+
+type httpMembersAPI struct {
+	client httpClient
+}
+
+func (m *httpMembersAPI) List(ctx context.Context) ([]Member, error) {
+	req := &membersAPIActionList{}
+	resp, body, err := m.client.Do(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
+		return nil, err
+	}
+
+	var mCollection memberCollection
+	if err := json.Unmarshal(body, &mCollection); err != nil {
+		return nil, err
+	}
+
+	return []Member(mCollection), nil
+}
+
+func (m *httpMembersAPI) Add(ctx context.Context, peerURL string) (*Member, error) {
+	urls, err := types.NewURLs([]string{peerURL})
+	if err != nil {
+		return nil, err
+	}
+
+	req := &membersAPIActionAdd{peerURLs: urls}
+	resp, body, err := m.client.Do(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := assertStatusCode(resp.StatusCode, http.StatusCreated, http.StatusConflict); err != nil {
+		return nil, err
+	}
+
+	if resp.StatusCode != http.StatusCreated {
+		var merr membersError
+		if err := json.Unmarshal(body, &merr); err != nil {
+			return nil, err
+		}
+		return nil, merr
+	}
+
+	var memb Member
+	if err := json.Unmarshal(body, &memb); err != nil {
+		return nil, err
+	}
+
+	return &memb, nil
+}
+
+func (m *httpMembersAPI) Update(ctx context.Context, memberID string, peerURLs []string) error {
+	urls, err := types.NewURLs(peerURLs)
+	if err != nil {
+		return err
+	}
+
+	req := &membersAPIActionUpdate{peerURLs: urls, memberID: memberID}
+	resp, body, err := m.client.Do(ctx, req)
+	if err != nil {
+		return err
+	}
+
+	if err := assertStatusCode(resp.StatusCode, http.StatusNoContent, http.StatusNotFound, http.StatusConflict); err != nil {
+		return err
+	}
+
+	if resp.StatusCode != http.StatusNoContent {
+		var merr membersError
+		if err := json.Unmarshal(body, &merr); err != nil {
+			return err
+		}
+		return merr
+	}
+
+	return nil
+}
+
+func (m *httpMembersAPI) Remove(ctx context.Context, memberID string) error {
+	req := &membersAPIActionRemove{memberID: memberID}
+	resp, _, err := m.client.Do(ctx, req)
+	if err != nil {
+		return err
+	}
+
+	return assertStatusCode(resp.StatusCode, http.StatusNoContent, http.StatusGone)
+}
+
+func (m *httpMembersAPI) Leader(ctx context.Context) (*Member, error) {
+	req := &membersAPIActionLeader{}
+	resp, body, err := m.client.Do(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
+		return nil, err
+	}
+
+	var leader Member
+	if err := json.Unmarshal(body, &leader); err != nil {
+		return nil, err
+	}
+
+	return &leader, nil
+}
+
+type membersAPIActionList struct{}
+
+func (l *membersAPIActionList) HTTPRequest(ep url.URL) *http.Request {
+	u := v2MembersURL(ep)
+	req, _ := http.NewRequest("GET", u.String(), nil)
+	return req
+}
+
+type membersAPIActionRemove struct {
+	memberID string
+}
+
+func (d *membersAPIActionRemove) HTTPRequest(ep url.URL) *http.Request {
+	u := v2MembersURL(ep)
+	u.Path = path.Join(u.Path, d.memberID)
+	req, _ := http.NewRequest("DELETE", u.String(), nil)
+	return req
+}
+
+type membersAPIActionAdd struct {
+	peerURLs types.URLs
+}
+
+func (a *membersAPIActionAdd) HTTPRequest(ep url.URL) *http.Request {
+	u := v2MembersURL(ep)
+	m := memberCreateOrUpdateRequest{PeerURLs: a.peerURLs}
+	b, _ := json.Marshal(&m)
+	req, _ := http.NewRequest("POST", u.String(), bytes.NewReader(b))
+	req.Header.Set("Content-Type", "application/json")
+	return req
+}
+
+type membersAPIActionUpdate struct {
+	memberID string
+	peerURLs types.URLs
+}
+
+func (a *membersAPIActionUpdate) HTTPRequest(ep url.URL) *http.Request {
+	u := v2MembersURL(ep)
+	m := memberCreateOrUpdateRequest{PeerURLs: a.peerURLs}
+	u.Path = path.Join(u.Path, a.memberID)
+	b, _ := json.Marshal(&m)
+	req, _ := http.NewRequest("PUT", u.String(), bytes.NewReader(b))
+	req.Header.Set("Content-Type", "application/json")
+	return req
+}
+
+func assertStatusCode(got int, want ...int) (err error) {
+	for _, w := range want {
+		if w == got {
+			return nil
+		}
+	}
+	return fmt.Errorf("unexpected status code %d", got)
+}
+
+type membersAPIActionLeader struct{}
+
+func (l *membersAPIActionLeader) HTTPRequest(ep url.URL) *http.Request {
+	u := v2MembersURL(ep)
+	u.Path = path.Join(u.Path, defaultLeaderSuffix)
+	req, _ := http.NewRequest("GET", u.String(), nil)
+	return req
+}
+
+// v2MembersURL add the necessary path to the provided endpoint
+// to route requests to the default v2 members API.
+func v2MembersURL(ep url.URL) *url.URL {
+	ep.Path = path.Join(ep.Path, defaultV2MembersPrefix)
+	return &ep
+}
+
+type membersError struct {
+	Message string `json:"message"`
+	Code    int    `json:"-"`
+}
+
+func (e membersError) Error() string {
+	return e.Message
+}
diff --git a/vendor/go.etcd.io/etcd/client/util.go b/vendor/go.etcd.io/etcd/client/util.go
new file mode 100644
index 0000000..15a8bab
--- /dev/null
+++ b/vendor/go.etcd.io/etcd/client/util.go
@@ -0,0 +1,53 @@
+// Copyright 2016 The etcd Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+import (
+	"regexp"
+)
+
+var (
+	roleNotFoundRegExp *regexp.Regexp
+	userNotFoundRegExp *regexp.Regexp
+)
+
+func init() {
+	roleNotFoundRegExp = regexp.MustCompile("auth: Role .* does not exist.")
+	userNotFoundRegExp = regexp.MustCompile("auth: User .* does not exist.")
+}
+
+// IsKeyNotFound returns true if the error code is ErrorCodeKeyNotFound.
+func IsKeyNotFound(err error) bool {
+	if cErr, ok := err.(Error); ok {
+		return cErr.Code == ErrorCodeKeyNotFound
+	}
+	return false
+}
+
+// IsRoleNotFound returns true if the error means role not found of v2 API.
+func IsRoleNotFound(err error) bool {
+	if ae, ok := err.(authError); ok {
+		return roleNotFoundRegExp.MatchString(ae.Message)
+	}
+	return false
+}
+
+// IsUserNotFound returns true if the error means user not found of v2 API.
+func IsUserNotFound(err error) bool {
+	if ae, ok := err.(authError); ok {
+		return userNotFoundRegExp.MatchString(ae.Message)
+	}
+	return false
+}