Merge github.com:grpc/grpc into cleaner-posix2

Makefile

build.yaml

src/core/lib/client_config/uri_parser.c

src/core/lib/client_config/uri_parser.h

src/core/lib/iomgr/tcp_client_windows.c

src/core/lib/json/json_reader.c

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

src/python/grpcio/tests/interop/_secure_interop_test.py

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

src/python/grpcio/tests/unit/beta/_beta_features_test.py

src/python/grpcio/tests/unit/beta/_face_interface_test.py

src/python/grpcio/tests/unit/beta/_implementations_test.py

test/core/client_config/uri_parser_test.c

test/core/end2end/goaway_server_test.c

...core/json/corpus/15a8f2e7f94aa00b46f1b991416aa015dd633580

...core/json/corpus/56cd60743c2cee939f5f357905bd36ec9363f441

...core/json/corpus/743e89b768af4bd591ea7228118550b1bfb8e7d1

...core/json/corpus/775e8ffda1f5d340dba472d06dc7c8bf8159e379

...core/json/corpus/8d952ec2e33b2a6a1c7876898719a610f5546388

...core/json/corpus/a0d4af29c6c223b48fe34d6a09b3a7466242f33c