diff --git a/vendor/go.etcd.io/etcd/clientv3/README.md b/vendor/go.etcd.io/etcd/clientv3/README.md
index 0b2dc9a..6c6fe7c 100644
--- a/vendor/go.etcd.io/etcd/clientv3/README.md
+++ b/vendor/go.etcd.io/etcd/clientv3/README.md
@@ -1,12 +1,10 @@
 # etcd/clientv3
 
-[![Docs](https://readthedocs.org/projects/etcd/badge/?version=latest&style=flat-square)](https://etcd.readthedocs.io/en/latest/?badge=latest)
+[![Docs](https://img.shields.io/badge/docs-latest-green.svg)](https://etcd.io/docs)
 [![Godoc](https://img.shields.io/badge/go-documentation-blue.svg?style=flat-square)](https://godoc.org/go.etcd.io/etcd/clientv3)
 
 `etcd/clientv3` is the official Go etcd client for v3.
 
-See https://etcd.readthedocs.io/en/latest for latest client architecture.
-
 ## Install
 
 ```bash
diff --git a/vendor/go.etcd.io/etcd/clientv3/auth.go b/vendor/go.etcd.io/etcd/clientv3/auth.go
index 921f50f..c954f1b 100644
--- a/vendor/go.etcd.io/etcd/clientv3/auth.go
+++ b/vendor/go.etcd.io/etcd/clientv3/auth.go
@@ -52,6 +52,8 @@
 	PermReadWrite = authpb.READWRITE
 )
 
+type UserAddOptions authpb.UserAddOptions
+
 type Auth interface {
 	// AuthEnable enables auth of an etcd cluster.
 	AuthEnable(ctx context.Context) (*AuthEnableResponse, error)
@@ -62,6 +64,9 @@
 	// UserAdd adds a new user to an etcd cluster.
 	UserAdd(ctx context.Context, name string, password string) (*AuthUserAddResponse, error)
 
+	// UserAddWithOptions adds a new user to an etcd cluster with some options.
+	UserAddWithOptions(ctx context.Context, name string, password string, opt *UserAddOptions) (*AuthUserAddResponse, error)
+
 	// UserDelete deletes a user from an etcd cluster.
 	UserDelete(ctx context.Context, name string) (*AuthUserDeleteResponse, error)
 
@@ -123,7 +128,12 @@
 }
 
 func (auth *authClient) UserAdd(ctx context.Context, name string, password string) (*AuthUserAddResponse, error) {
-	resp, err := auth.remote.UserAdd(ctx, &pb.AuthUserAddRequest{Name: name, Password: password}, auth.callOpts...)
+	resp, err := auth.remote.UserAdd(ctx, &pb.AuthUserAddRequest{Name: name, Password: password, Options: &authpb.UserAddOptions{NoPassword: false}}, auth.callOpts...)
+	return (*AuthUserAddResponse)(resp), toErr(ctx, err)
+}
+
+func (auth *authClient) UserAddWithOptions(ctx context.Context, name string, password string, options *UserAddOptions) (*AuthUserAddResponse, error) {
+	resp, err := auth.remote.UserAdd(ctx, &pb.AuthUserAddRequest{Name: name, Password: password, Options: (*authpb.UserAddOptions)(options)}, auth.callOpts...)
 	return (*AuthUserAddResponse)(resp), toErr(ctx, err)
 }
 
diff --git a/vendor/go.etcd.io/etcd/clientv3/balancer/balancer.go b/vendor/go.etcd.io/etcd/clientv3/balancer/balancer.go
index 3c44e70..c39702e 100644
--- a/vendor/go.etcd.io/etcd/clientv3/balancer/balancer.go
+++ b/vendor/go.etcd.io/etcd/clientv3/balancer/balancer.go
@@ -54,7 +54,7 @@
 	bb := &baseBalancer{
 		id:     strconv.FormatInt(time.Now().UnixNano(), 36),
 		policy: b.cfg.Policy,
-		name:   b.cfg.Policy.String(),
+		name:   b.cfg.Name,
 		lg:     b.cfg.Logger,
 
 		addrToSc: make(map[resolver.Address]balancer.SubConn),
@@ -67,9 +67,6 @@
 		// initialize picker always returns "ErrNoSubConnAvailable"
 		Picker: picker.NewErr(balancer.ErrNoSubConnAvailable),
 	}
-	if b.cfg.Name != "" {
-		bb.name = b.cfg.Name
-	}
 	if bb.lg == nil {
 		bb.lg = zap.NewNop()
 	}
@@ -224,7 +221,6 @@
 	}
 
 	bb.currentConn.UpdateBalancerState(bb.currentState, bb.Picker)
-	return
 }
 
 func (bb *baseBalancer) regeneratePicker() {
diff --git a/vendor/go.etcd.io/etcd/clientv3/balancer/picker/picker_policy.go b/vendor/go.etcd.io/etcd/clientv3/balancer/picker/picker_policy.go
index 463ddc2..7bca39c 100644
--- a/vendor/go.etcd.io/etcd/clientv3/balancer/picker/picker_policy.go
+++ b/vendor/go.etcd.io/etcd/clientv3/balancer/picker/picker_policy.go
@@ -31,7 +31,7 @@
 	// TODO: only send loads to pinned address "RoundrobinFailover"
 	// just like how 3.3 client works
 	//
-	// TODO: priotize leader
+	// TODO: prioritize leader
 	// TODO: health-check
 	// TODO: weighted roundrobin
 	// TODO: power of two random choice
diff --git a/vendor/go.etcd.io/etcd/clientv3/client.go b/vendor/go.etcd.io/etcd/clientv3/client.go
index 445ecfe..b91cbf9 100644
--- a/vendor/go.etcd.io/etcd/clientv3/client.go
+++ b/vendor/go.etcd.io/etcd/clientv3/client.go
@@ -77,9 +77,8 @@
 
 	cfg           Config
 	creds         *credentials.TransportCredentials
-	balancer      balancer.Balancer
 	resolverGroup *endpoint.ResolverGroup
-	mu            *sync.Mutex
+	mu            *sync.RWMutex
 
 	ctx    context.Context
 	cancel context.CancelFunc
@@ -143,11 +142,13 @@
 func (c *Client) Ctx() context.Context { return c.ctx }
 
 // Endpoints lists the registered endpoints for the client.
-func (c *Client) Endpoints() (eps []string) {
+func (c *Client) Endpoints() []string {
 	// copy the slice; protect original endpoints from being changed
-	eps = make([]string, len(c.cfg.Endpoints))
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+	eps := make([]string, len(c.cfg.Endpoints))
 	copy(eps, c.cfg.Endpoints)
-	return
+	return eps
 }
 
 // SetEndpoints updates client's endpoints.
@@ -442,7 +443,7 @@
 		creds:    creds,
 		ctx:      ctx,
 		cancel:   cancel,
-		mu:       new(sync.Mutex),
+		mu:       new(sync.RWMutex),
 		callOpts: defaultCallOpts,
 	}
 
diff --git a/vendor/go.etcd.io/etcd/clientv3/cluster.go b/vendor/go.etcd.io/etcd/clientv3/cluster.go
index d497c05..ce97e5c 100644
--- a/vendor/go.etcd.io/etcd/clientv3/cluster.go
+++ b/vendor/go.etcd.io/etcd/clientv3/cluster.go
@@ -24,11 +24,12 @@
 )
 
 type (
-	Member               pb.Member
-	MemberListResponse   pb.MemberListResponse
-	MemberAddResponse    pb.MemberAddResponse
-	MemberRemoveResponse pb.MemberRemoveResponse
-	MemberUpdateResponse pb.MemberUpdateResponse
+	Member                pb.Member
+	MemberListResponse    pb.MemberListResponse
+	MemberAddResponse     pb.MemberAddResponse
+	MemberRemoveResponse  pb.MemberRemoveResponse
+	MemberUpdateResponse  pb.MemberUpdateResponse
+	MemberPromoteResponse pb.MemberPromoteResponse
 )
 
 type Cluster interface {
@@ -38,11 +39,17 @@
 	// MemberAdd adds a new member into the cluster.
 	MemberAdd(ctx context.Context, peerAddrs []string) (*MemberAddResponse, error)
 
+	// MemberAddAsLearner adds a new learner member into the cluster.
+	MemberAddAsLearner(ctx context.Context, peerAddrs []string) (*MemberAddResponse, error)
+
 	// MemberRemove removes an existing member from the cluster.
 	MemberRemove(ctx context.Context, id uint64) (*MemberRemoveResponse, error)
 
 	// MemberUpdate updates the peer addresses of the member.
 	MemberUpdate(ctx context.Context, id uint64, peerAddrs []string) (*MemberUpdateResponse, error)
+
+	// MemberPromote promotes a member from raft learner (non-voting) to raft voting member.
+	MemberPromote(ctx context.Context, id uint64) (*MemberPromoteResponse, error)
 }
 
 type cluster struct {
@@ -67,12 +74,23 @@
 }
 
 func (c *cluster) MemberAdd(ctx context.Context, peerAddrs []string) (*MemberAddResponse, error) {
+	return c.memberAdd(ctx, peerAddrs, false)
+}
+
+func (c *cluster) MemberAddAsLearner(ctx context.Context, peerAddrs []string) (*MemberAddResponse, error) {
+	return c.memberAdd(ctx, peerAddrs, true)
+}
+
+func (c *cluster) memberAdd(ctx context.Context, peerAddrs []string, isLearner bool) (*MemberAddResponse, error) {
 	// fail-fast before panic in rafthttp
 	if _, err := types.NewURLs(peerAddrs); err != nil {
 		return nil, err
 	}
 
-	r := &pb.MemberAddRequest{PeerURLs: peerAddrs}
+	r := &pb.MemberAddRequest{
+		PeerURLs:  peerAddrs,
+		IsLearner: isLearner,
+	}
 	resp, err := c.remote.MemberAdd(ctx, r, c.callOpts...)
 	if err != nil {
 		return nil, toErr(ctx, err)
@@ -112,3 +130,12 @@
 	}
 	return nil, toErr(ctx, err)
 }
+
+func (c *cluster) MemberPromote(ctx context.Context, id uint64) (*MemberPromoteResponse, error) {
+	r := &pb.MemberPromoteRequest{ID: id}
+	resp, err := c.remote.MemberPromote(ctx, r, c.callOpts...)
+	if err != nil {
+		return nil, toErr(ctx, err)
+	}
+	return (*MemberPromoteResponse)(resp), nil
+}
diff --git a/vendor/go.etcd.io/etcd/clientv3/concurrency/session.go b/vendor/go.etcd.io/etcd/clientv3/concurrency/session.go
index 598ec0e..97eb763 100644
--- a/vendor/go.etcd.io/etcd/clientv3/concurrency/session.go
+++ b/vendor/go.etcd.io/etcd/clientv3/concurrency/session.go
@@ -47,7 +47,7 @@
 		if err != nil {
 			return nil, err
 		}
-		id = v3.LeaseID(resp.ID)
+		id = resp.ID
 	}
 
 	ctx, cancel := context.WithCancel(ops.ctx)
diff --git a/vendor/go.etcd.io/etcd/clientv3/op.go b/vendor/go.etcd.io/etcd/clientv3/op.go
index 085dd28..81ae31f 100644
--- a/vendor/go.etcd.io/etcd/clientv3/op.go
+++ b/vendor/go.etcd.io/etcd/clientv3/op.go
@@ -113,13 +113,13 @@
 func (op Op) IsDelete() bool { return op.t == tDeleteRange }
 
 // IsSerializable returns true if the serializable field is true.
-func (op Op) IsSerializable() bool { return op.serializable == true }
+func (op Op) IsSerializable() bool { return op.serializable }
 
 // IsKeysOnly returns whether keysOnly is set.
-func (op Op) IsKeysOnly() bool { return op.keysOnly == true }
+func (op Op) IsKeysOnly() bool { return op.keysOnly }
 
 // IsCountOnly returns whether countOnly is set.
-func (op Op) IsCountOnly() bool { return op.countOnly == true }
+func (op Op) IsCountOnly() bool { return op.countOnly }
 
 // MinModRev returns the operation's minimum modify revision.
 func (op Op) MinModRev() int64 { return op.minModRev }
diff --git a/vendor/go.etcd.io/etcd/clientv3/options.go b/vendor/go.etcd.io/etcd/clientv3/options.go
index 4660ace..700714c 100644
--- a/vendor/go.etcd.io/etcd/clientv3/options.go
+++ b/vendor/go.etcd.io/etcd/clientv3/options.go
@@ -47,7 +47,7 @@
 	// client-side streaming retry limit, only applied to requests where server responds with
 	// a error code clearly indicating it was unable to process the request such as codes.Unavailable.
 	// If set to 0, retry is disabled.
-	defaultStreamMaxRetries = uint(^uint(0)) // max uint
+	defaultStreamMaxRetries = ^uint(0) // max uint
 
 	// client-side retry backoff wait between requests.
 	defaultBackoffWaitBetween = 25 * time.Millisecond
diff --git a/vendor/go.etcd.io/etcd/clientv3/ready_wait.go b/vendor/go.etcd.io/etcd/clientv3/ready_wait.go
deleted file mode 100644
index c6ef585..0000000
--- a/vendor/go.etcd.io/etcd/clientv3/ready_wait.go
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright 2017 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"
-
-// TODO: remove this when "FailFast=false" is fixed.
-// See https://github.com/grpc/grpc-go/issues/1532.
-func readyWait(rpcCtx, clientCtx context.Context, ready <-chan struct{}) error {
-	select {
-	case <-ready:
-		return nil
-	case <-rpcCtx.Done():
-		return rpcCtx.Err()
-	case <-clientCtx.Done():
-		return clientCtx.Err()
-	}
-}
diff --git a/vendor/go.etcd.io/etcd/clientv3/retry.go b/vendor/go.etcd.io/etcd/clientv3/retry.go
index 38ad00a..7e855de 100644
--- a/vendor/go.etcd.io/etcd/clientv3/retry.go
+++ b/vendor/go.etcd.io/etcd/clientv3/retry.go
@@ -43,10 +43,6 @@
 	}
 }
 
-type rpcFunc func(ctx context.Context) error
-type retryRPCFunc func(context.Context, rpcFunc, retryPolicy) error
-type retryStopErrFunc func(error) bool
-
 // isSafeRetryImmutableRPC returns "true" when an immutable request is safe for retry.
 //
 // immutable requests (e.g. Get) should be retried unless it's
@@ -183,6 +179,10 @@
 	return rcc.cc.MemberUpdate(ctx, in, opts...)
 }
 
+func (rcc *retryClusterClient) MemberPromote(ctx context.Context, in *pb.MemberPromoteRequest, opts ...grpc.CallOption) (resp *pb.MemberPromoteResponse, err error) {
+	return rcc.cc.MemberPromote(ctx, in, opts...)
+}
+
 type retryMaintenanceClient struct {
 	mc pb.MaintenanceClient
 }
diff --git a/vendor/go.etcd.io/etcd/clientv3/retry_interceptor.go b/vendor/go.etcd.io/etcd/clientv3/retry_interceptor.go
index e48a003..080490a 100644
--- a/vendor/go.etcd.io/etcd/clientv3/retry_interceptor.go
+++ b/vendor/go.etcd.io/etcd/clientv3/retry_interceptor.go
@@ -28,6 +28,7 @@
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/status"
 )
 
 // unaryClientInterceptor returns a new retrying unary client interceptor.
@@ -79,7 +80,7 @@
 						zap.String("target", cc.Target()),
 						zap.Error(gterr),
 					)
-					return lastErr // return the original error for simplicity
+					return gterr // lastErr must be invalid auth token
 				}
 				continue
 			}
@@ -109,7 +110,7 @@
 			return streamer(ctx, desc, cc, method, grpcOpts...)
 		}
 		if desc.ClientStreams {
-			return nil, grpc.Errorf(codes.Unimplemented, "clientv3/retry_interceptor: cannot retry on ClientStreams, set Disable()")
+			return nil, status.Errorf(codes.Unimplemented, "clientv3/retry_interceptor: cannot retry on ClientStreams, set Disable()")
 		}
 		newStreamer, err := streamer(ctx, desc, cc, method, grpcOpts...)
 		logger.Warn("retry stream intercept", zap.Error(err))
@@ -296,11 +297,11 @@
 func contextErrToGrpcErr(err error) error {
 	switch err {
 	case context.DeadlineExceeded:
-		return grpc.Errorf(codes.DeadlineExceeded, err.Error())
+		return status.Errorf(codes.DeadlineExceeded, err.Error())
 	case context.Canceled:
-		return grpc.Errorf(codes.Canceled, err.Error())
+		return status.Errorf(codes.Canceled, err.Error())
 	default:
-		return grpc.Errorf(codes.Unknown, err.Error())
+		return status.Errorf(codes.Unknown, err.Error())
 	}
 }
 
@@ -328,13 +329,6 @@
 	}}
 }
 
-// withAuthRetry sets enables authentication retries.
-func withAuthRetry(retryAuth bool) retryOption {
-	return retryOption{applyFunc: func(o *options) {
-		o.retryAuth = retryAuth
-	}}
-}
-
 // withMax sets the maximum number of retries on this call, or this interceptor.
 func withMax(maxRetries uint) retryOption {
 	return retryOption{applyFunc: func(o *options) {
diff --git a/vendor/go.etcd.io/etcd/clientv3/watch.go b/vendor/go.etcd.io/etcd/clientv3/watch.go
index d50acbc..87d222d 100644
--- a/vendor/go.etcd.io/etcd/clientv3/watch.go
+++ b/vendor/go.etcd.io/etcd/clientv3/watch.go
@@ -384,6 +384,7 @@
 
 	w.mu.Lock()
 	if w.streams == nil {
+		w.mu.Unlock()
 		return fmt.Errorf("no stream found for context")
 	}
 	wgs := w.streams[ctxKey]