Merge pull request #6944 from nathanielmanistaatgoogle/fatal_failure→shutdown

src/python/grpcio/grpc/__init__.py

src/python/grpcio/grpc/_adapter/_types.py

src/python/grpcio/grpc/_common.py

src/python/grpcio/grpc/_cython/_cygrpc/records.pyx.pxi

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

src/python/grpcio/tests/tests.json

src/python/grpcio/tests/unit/_api_test.py

...thon/grpcio/tests/unit/beta/_connectivity_channel_test.py