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

.gitmodules

BUILD

CMakeLists.txt

Makefile

build.yaml

examples/ruby/route_guide/route_guide_client.rb

examples/ruby/route_guide/route_guide_server.rb

grpc.gemspec

include/grpc++/create_channel_posix.h

include/grpc++/server.h

include/grpc/grpc_posix.h

include/grpc/impl/codegen/grpc_types.h

src/compiler/python_generator.cc

src/core/ext/client_config/subchannel.c

...xt/transport/chttp2/server/insecure/server_chttp2_posix.c

src/core/lib/iomgr/ev_epoll_linux.c

src/core/lib/iomgr/tcp_windows.c

src/core/lib/surface/server.c

src/core/lib/surface/server.h

src/cpp/client/create_channel_posix.cc