Merge remote-tracking branch 'upstream/master' into service_config2

BUILD

CMakeLists.txt

Makefile

binding.gyp

build.yaml

config.m4

...es/node/dynamic_codegen/route_guide/route_guide_client.js

...les/node/static_codegen/route_guide/route_guide_client.js

gRPC-Core.podspec

grpc.gemspec

include/grpc++/ext/reflection.grpc.pb.h

include/grpc++/impl/codegen/method_handler_impl.h

include/grpc++/impl/codegen/server_context.h

include/grpc++/impl/codegen/service_type.h

include/grpc++/impl/codegen/sync_stream.h

package.xml

src/compiler/cpp_generator.cc

src/core/ext/client_channel/README.md

src/core/ext/client_channel/channel_connectivity.c

src/core/ext/client_channel/client_channel.c