Merge branch 'master' into grpc_bazel

.pylintrc

CMakeLists.txt

Makefile

build.yaml

src/core/lib/support/sync.c

src/core/lib/surface/call.c

src/core/lib/transport/transport.c

src/core/lib/transport/transport.h

src/core/lib/tsi/test_creds/BUILD

src/python/grpcio/grpc/__init__.py

src/python/grpcio/grpc/_auth.py

src/python/grpcio/grpc/_channel.py

src/python/grpcio/grpc/_common.py

src/python/grpcio/grpc/_plugin_wrapping.py

src/python/grpcio/grpc/_server.py

src/python/grpcio/grpc/beta/_client_adaptations.py

src/python/grpcio/grpc/beta/_server_adaptations.py

src/python/grpcio/grpc/beta/implementations.py

src/python/grpcio/grpc/framework/foundation/logging_pool.py

test/core/census/BUILD