Merge branch 'idempotent_endpoint_shutdown' into handshake_timeout

BUILD

Makefile

binding.gyp

build.yaml

composer.json

config.m4

doc/c-style-guide.md

doc/cpp-style-guide.md

doc/statuscodes.md

gRPC.podspec

grpc.gemspec

include/grpc++/ext/proto_server_reflection_plugin.h

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

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

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

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

include/grpc++/server_builder.h

include/grpc/impl/codegen/log.h

include/grpc/impl/codegen/port_platform.h

include/grpc/support/string_util.h