Update protobuf,grpc,etcd dependencies

1. Updated etcd/protobuf/grpc dependencies:

echo "
hack/pin-dependency.sh github.com/golang/protobuf latest
hack/pin-dependency.sh google.golang.org/protobuf latest
hack/pin-dependency.sh go.etcd.io/etcd/api/v3 v3.5.0-rc.0
hack/pin-dependency.sh go.etcd.io/etcd/client/v3 v3.5.0-rc.0
hack/pin-dependency.sh go.etcd.io/etcd/client/pkg/v3 v3.5.0-rc.0
hack/pin-dependency.sh go.etcd.io/etcd/pkg/v3 v3.5.0-rc.0
hack/pin-dependency.sh go.etcd.io/etcd/server/v3 v3.5.0-rc.0
hack/pin-dependency.sh go.etcd.io/etcd/tests/v3 v3.5.0-rc.0
hack/pin-dependency.sh google.golang.org/grpc latest
" | bash

2. Linted transitive dependencies until versions are clean:

hack/lint-dependencies.sh  | grep "  hack/pin-dependency.sh" | bash

3. Linted dependencies until dropped versions are clean:

hack/lint-dependencies.sh  | grep "dropreplace" | bash

4. Updated vendor and internal modules:

hack/update-vendor.sh
hack/update-internal-modules.sh

Repeated steps 2-4 until clean

vendor/google.golang.org/grpc/resolver/dns/dns_resolver.go

@@ -1,36 +0,0 @@
-/*
- *
- * Copyright 2018 gRPC 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 dns implements a dns resolver to be installed as the default resolver
-// in grpc.
-//
-// Deprecated: this package is imported by grpc and should not need to be
-// imported directly by users.
-package dns
-
-import (
-	"google.golang.org/grpc/internal/resolver/dns"
-	"google.golang.org/grpc/resolver"
-)
-
-// NewBuilder creates a dnsBuilder which is used to factory DNS resolvers.
-//
-// Deprecated: import grpc and use resolver.Get("dns") instead.
-func NewBuilder() resolver.Builder {
-	return dns.NewBuilder()
-}

vendor/google.golang.org/grpc/resolver/manual/manual.go

@@ -0,0 +1,80 @@
+/*
+ *
+ * Copyright 2017 gRPC 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 manual defines a resolver that can be used to manually send resolved
+// addresses to ClientConn.
+package manual
+
+import (
+	"google.golang.org/grpc/resolver"
+)
+
+// NewBuilderWithScheme creates a new test resolver builder with the given scheme.
+func NewBuilderWithScheme(scheme string) *Resolver {
+	return &Resolver{
+		ResolveNowCallback: func(resolver.ResolveNowOptions) {},
+		scheme:             scheme,
+	}
+}
+
+// Resolver is also a resolver builder.
+// It's build() function always returns itself.
+type Resolver struct {
+	// ResolveNowCallback is called when the ResolveNow method is called on the
+	// resolver.  Must not be nil.  Must not be changed after the resolver may
+	// be built.
+	ResolveNowCallback func(resolver.ResolveNowOptions)
+	scheme             string
+
+	// Fields actually belong to the resolver.
+	CC             resolver.ClientConn
+	bootstrapState *resolver.State
+}
+
+// InitialState adds initial state to the resolver so that UpdateState doesn't
+// need to be explicitly called after Dial.
+func (r *Resolver) InitialState(s resolver.State) {
+	r.bootstrapState = &s
+}
+
+// Build returns itself for Resolver, because it's both a builder and a resolver.
+func (r *Resolver) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
+	r.CC = cc
+	if r.bootstrapState != nil {
+		r.UpdateState(*r.bootstrapState)
+	}
+	return r, nil
+}
+
+// Scheme returns the test scheme.
+func (r *Resolver) Scheme() string {
+	return r.scheme
+}
+
+// ResolveNow is a noop for Resolver.
+func (r *Resolver) ResolveNow(o resolver.ResolveNowOptions) {
+	r.ResolveNowCallback(o)
+}
+
+// Close is a noop for Resolver.
+func (*Resolver) Close() {}
+
+// UpdateState calls CC.UpdateState.
+func (r *Resolver) UpdateState(s resolver.State) {
+	r.CC.UpdateState(s)
+}

vendor/google.golang.org/grpc/resolver/passthrough/passthrough.go

@@ -1,26 +0,0 @@
-/*
- *
- * Copyright 2017 gRPC 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 passthrough implements a pass-through resolver. It sends the target
-// name without scheme back to gRPC as resolved address.
-//
-// Deprecated: this package is imported by grpc and should not need to be
-// imported directly by users.
-package passthrough
-
-import _ "google.golang.org/grpc/internal/resolver/passthrough" // import for side effects after package was moved

vendor/google.golang.org/grpc/resolver/resolver.go

@@ -85,12 +85,19 @@ const (
 	Backend AddressType = iota
 	// GRPCLB indicates the address is for a grpclb load balancer.
 	//
-	// Deprecated: use Attributes in Address instead.
+	// Deprecated: to select the GRPCLB load balancing policy, use a service
+	// config with a corresponding loadBalancingConfig.  To supply balancer
+	// addresses to the GRPCLB load balancing policy, set State.Attributes
+	// using balancer/grpclb/state.Set.
 	GRPCLB
 )
 
 // Address represents a server the client connects to.
-// This is the EXPERIMENTAL API and may be changed or extended in the future.
+//
+// Experimental
+//
+// Notice: This type is EXPERIMENTAL and may be changed or removed in a
+// later release.
 type Address struct {
 	// Addr is the server address on which a connection will be established.
 	Addr string
@@ -174,7 +181,7 @@ type State struct {
 // gRPC to add new methods to this interface.
 type ClientConn interface {
 	// UpdateState updates the state of the ClientConn appropriately.
-	UpdateState(State)
+	UpdateState(State) error
 	// ReportError notifies the ClientConn that the Resolver encountered an
 	// error.  The ClientConn will notify the load balancer and begin calling
 	// ResolveNow on the Resolver with exponential backoff.