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
+}