Merge pull request #1073 from nathanielmanistaatgoogle/python-refactor

src/python/src/grpc/_adapter/_face_test_case.py

src/python/src/grpc/_adapter/_links_test.py

src/python/src/grpc/_adapter/_lonely_rear_link_test.py

src/python/src/grpc/_adapter/_test_links.py

src/python/src/grpc/_adapter/fore.py

src/python/src/grpc/_adapter/rear.py

src/python/src/grpc/early_adopter/implementations.py

src/python/src/grpc/framework/base/_cancellation.py

src/python/src/grpc/framework/base/_constants.py

src/python/src/grpc/framework/base/_context.py

src/python/src/grpc/framework/base/_emission.py

src/python/src/grpc/framework/base/_ends.py

src/python/src/grpc/framework/base/_expiration.py

src/python/src/grpc/framework/base/_ingestion.py

src/python/src/grpc/framework/base/_interfaces.py

src/python/src/grpc/framework/base/_reception.py

src/python/src/grpc/framework/base/_termination.py

src/python/src/grpc/framework/base/_transmission.py

src/python/src/grpc/framework/base/implementations.py

src/python/src/grpc/framework/base/implementations_test.py