Merge pull request #1728 from ctiller/i-will-survive

.travis.yml

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/fore.py

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

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

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

src/python/src/grpc/framework/face/_test_case.py

src/python/src/grpc/framework/face/demonstration.py

src/python/src/grpc/framework/face/testing/base_util.py

...future_invocation_asynchronous_event_service_test_case.py