Merge pull request #2816 from soltanmm/health-check

src/python/grpcio_health_checking/MANIFEST.in

src/python/grpcio_health_checking/README.rst

src/python/grpcio_health_checking/commands.py

src/python/grpcio_health_checking/grpc/__init__.py

src/python/grpcio_health_checking/grpc/health/__init__.py

...on/grpcio_health_checking/grpc/health/v1alpha/__init__.py

...n/grpcio_health_checking/grpc/health/v1alpha/health.proto

...thon/grpcio_health_checking/grpc/health/v1alpha/health.py

src/python/grpcio_health_checking/setup.py

tools/run_tests/build_python.sh