diff --git a/vendor/github.com/coreos/etcd/clientv3/maintenance.go b/vendor/github.com/coreos/etcd/clientv3/maintenance.go
new file mode 100644
index 0000000..5e87cf8
--- /dev/null
+++ b/vendor/github.com/coreos/etcd/clientv3/maintenance.go
@@ -0,0 +1,239 @@
+// 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 clientv3
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
+
+	"google.golang.org/grpc"
+)
+
+type (
+	DefragmentResponse pb.DefragmentResponse
+	AlarmResponse      pb.AlarmResponse
+	AlarmMember        pb.AlarmMember
+	StatusResponse     pb.StatusResponse
+	HashKVResponse     pb.HashKVResponse
+	MoveLeaderResponse pb.MoveLeaderResponse
+)
+
+type Maintenance interface {
+	// AlarmList gets all active alarms.
+	AlarmList(ctx context.Context) (*AlarmResponse, error)
+
+	// AlarmDisarm disarms a given alarm.
+	AlarmDisarm(ctx context.Context, m *AlarmMember) (*AlarmResponse, error)
+
+	// Defragment releases wasted space from internal fragmentation on a given etcd member.
+	// Defragment is only needed when deleting a large number of keys and want to reclaim
+	// the resources.
+	// Defragment is an expensive operation. User should avoid defragmenting multiple members
+	// at the same time.
+	// To defragment multiple members in the cluster, user need to call defragment multiple
+	// times with different endpoints.
+	Defragment(ctx context.Context, endpoint string) (*DefragmentResponse, error)
+
+	// Status gets the status of the endpoint.
+	Status(ctx context.Context, endpoint string) (*StatusResponse, error)
+
+	// HashKV returns a hash of the KV state at the time of the RPC.
+	// If revision is zero, the hash is computed on all keys. If the revision
+	// is non-zero, the hash is computed on all keys at or below the given revision.
+	HashKV(ctx context.Context, endpoint string, rev int64) (*HashKVResponse, error)
+
+	// Snapshot provides a reader for a point-in-time snapshot of etcd.
+	// If the context "ctx" is canceled or timed out, reading from returned
+	// "io.ReadCloser" would error out (e.g. context.Canceled, context.DeadlineExceeded).
+	Snapshot(ctx context.Context) (io.ReadCloser, error)
+
+	// MoveLeader requests current leader to transfer its leadership to the transferee.
+	// Request must be made to the leader.
+	MoveLeader(ctx context.Context, transfereeID uint64) (*MoveLeaderResponse, error)
+}
+
+type maintenance struct {
+	dial     func(endpoint string) (pb.MaintenanceClient, func(), error)
+	remote   pb.MaintenanceClient
+	callOpts []grpc.CallOption
+}
+
+func NewMaintenance(c *Client) Maintenance {
+	api := &maintenance{
+		dial: func(endpoint string) (pb.MaintenanceClient, func(), error) {
+			conn, err := c.Dial(endpoint)
+			if err != nil {
+				return nil, nil, fmt.Errorf("failed to dial endpoint %s with maintenance client: %v", endpoint, err)
+			}
+			cancel := func() { conn.Close() }
+			return RetryMaintenanceClient(c, conn), cancel, nil
+		},
+		remote: RetryMaintenanceClient(c, c.conn),
+	}
+	if c != nil {
+		api.callOpts = c.callOpts
+	}
+	return api
+}
+
+func NewMaintenanceFromMaintenanceClient(remote pb.MaintenanceClient, c *Client) Maintenance {
+	api := &maintenance{
+		dial: func(string) (pb.MaintenanceClient, func(), error) {
+			return remote, func() {}, nil
+		},
+		remote: remote,
+	}
+	if c != nil {
+		api.callOpts = c.callOpts
+	}
+	return api
+}
+
+func (m *maintenance) AlarmList(ctx context.Context) (*AlarmResponse, error) {
+	req := &pb.AlarmRequest{
+		Action:   pb.AlarmRequest_GET,
+		MemberID: 0,                 // all
+		Alarm:    pb.AlarmType_NONE, // all
+	}
+	resp, err := m.remote.Alarm(ctx, req, m.callOpts...)
+	if err == nil {
+		return (*AlarmResponse)(resp), nil
+	}
+	return nil, toErr(ctx, err)
+}
+
+func (m *maintenance) AlarmDisarm(ctx context.Context, am *AlarmMember) (*AlarmResponse, error) {
+	req := &pb.AlarmRequest{
+		Action:   pb.AlarmRequest_DEACTIVATE,
+		MemberID: am.MemberID,
+		Alarm:    am.Alarm,
+	}
+
+	if req.MemberID == 0 && req.Alarm == pb.AlarmType_NONE {
+		ar, err := m.AlarmList(ctx)
+		if err != nil {
+			return nil, toErr(ctx, err)
+		}
+		ret := AlarmResponse{}
+		for _, am := range ar.Alarms {
+			dresp, derr := m.AlarmDisarm(ctx, (*AlarmMember)(am))
+			if derr != nil {
+				return nil, toErr(ctx, derr)
+			}
+			ret.Alarms = append(ret.Alarms, dresp.Alarms...)
+		}
+		return &ret, nil
+	}
+
+	resp, err := m.remote.Alarm(ctx, req, m.callOpts...)
+	if err == nil {
+		return (*AlarmResponse)(resp), nil
+	}
+	return nil, toErr(ctx, err)
+}
+
+func (m *maintenance) Defragment(ctx context.Context, endpoint string) (*DefragmentResponse, error) {
+	remote, cancel, err := m.dial(endpoint)
+	if err != nil {
+		return nil, toErr(ctx, err)
+	}
+	defer cancel()
+	resp, err := remote.Defragment(ctx, &pb.DefragmentRequest{}, m.callOpts...)
+	if err != nil {
+		return nil, toErr(ctx, err)
+	}
+	return (*DefragmentResponse)(resp), nil
+}
+
+func (m *maintenance) Status(ctx context.Context, endpoint string) (*StatusResponse, error) {
+	remote, cancel, err := m.dial(endpoint)
+	if err != nil {
+		return nil, toErr(ctx, err)
+	}
+	defer cancel()
+	resp, err := remote.Status(ctx, &pb.StatusRequest{}, m.callOpts...)
+	if err != nil {
+		return nil, toErr(ctx, err)
+	}
+	return (*StatusResponse)(resp), nil
+}
+
+func (m *maintenance) HashKV(ctx context.Context, endpoint string, rev int64) (*HashKVResponse, error) {
+	remote, cancel, err := m.dial(endpoint)
+	if err != nil {
+
+		return nil, toErr(ctx, err)
+	}
+	defer cancel()
+	resp, err := remote.HashKV(ctx, &pb.HashKVRequest{Revision: rev}, m.callOpts...)
+	if err != nil {
+		return nil, toErr(ctx, err)
+	}
+	return (*HashKVResponse)(resp), nil
+}
+
+func (m *maintenance) Snapshot(ctx context.Context) (io.ReadCloser, error) {
+	ss, err := m.remote.Snapshot(ctx, &pb.SnapshotRequest{}, append(m.callOpts, withMax(defaultStreamMaxRetries))...)
+	if err != nil {
+		return nil, toErr(ctx, err)
+	}
+
+	plog.Info("opened snapshot stream; downloading")
+	pr, pw := io.Pipe()
+	go func() {
+		for {
+			resp, err := ss.Recv()
+			if err != nil {
+				switch err {
+				case io.EOF:
+					plog.Info("completed snapshot read; closing")
+				default:
+					plog.Warningf("failed to receive from snapshot stream; closing (%v)", err)
+				}
+				pw.CloseWithError(err)
+				return
+			}
+
+			// can "resp == nil && err == nil"
+			// before we receive snapshot SHA digest?
+			// No, server sends EOF with an empty response
+			// after it sends SHA digest at the end
+
+			if _, werr := pw.Write(resp.Blob); werr != nil {
+				pw.CloseWithError(werr)
+				return
+			}
+		}
+	}()
+	return &snapshotReadCloser{ctx: ctx, ReadCloser: pr}, nil
+}
+
+type snapshotReadCloser struct {
+	ctx context.Context
+	io.ReadCloser
+}
+
+func (rc *snapshotReadCloser) Read(p []byte) (n int, err error) {
+	n, err = rc.ReadCloser.Read(p)
+	return n, toErr(rc.ctx, err)
+}
+
+func (m *maintenance) MoveLeader(ctx context.Context, transfereeID uint64) (*MoveLeaderResponse, error) {
+	resp, err := m.remote.MoveLeader(ctx, &pb.MoveLeaderRequest{TargetID: transfereeID}, m.callOpts...)
+	return (*MoveLeaderResponse)(resp), toErr(ctx, err)
+}