Merge pull request #9600 from kpayson64/pin_yapf_1.1.x

src/python/grpcio/commands.py

src/python/grpcio/grpc/__init__.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/_utilities.py

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

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

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

...python/grpcio/grpc/framework/interfaces/base/utilities.py

src/python/grpcio/grpc/framework/interfaces/face/face.py

src/python/grpcio/support.py

src/python/grpcio_health_checking/setup.py

src/python/grpcio_reflection/setup.py

src/python/grpcio_tests/setup.py

src/python/grpcio_tests/tests/_result.py

...python/grpcio_tests/tests/interop/_secure_intraop_test.py

src/python/grpcio_tests/tests/interop/client.py

src/python/grpcio_tests/tests/interop/methods.py