Add generated file

This PR adds generated files under pkg/client and vendor folder.

vendor/google.golang.org/grpc/reflection/grpc_testing/proto2.proto

@@ -0,0 +1,22 @@
+// 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.
+
+syntax = "proto2";
+
+package grpc.testing;
+
+message ToBeExtended {
+  required int32 foo = 1;
+  extensions 10 to 30;
+}