Merge master into merge-0.14-into-master

BUILD

CMakeLists.txt

Makefile

build.yaml

doc/interop-test-descriptions.md

examples/cpp/helloworld/greeter_client.cc

src/core/lib/channel/channel_stack.c

src/core/lib/channel/channel_stack.h

src/core/lib/channel/http_client_filter.c

src/core/lib/transport/transport.c

src/core/lib/transport/transport.h

templates/CMakeLists.txt.template

test/core/end2end/bad_server_response_test.c

tools/run_tests/sources_and_headers.json

tools/run_tests/tests.json

vsprojects/buildtests_c.sln

vsprojects/grpc.sln

vsprojects/vcxproj/grpc++_unsecure/grpc++_unsecure.vcxproj

vsprojects/vcxproj/grpc_create_jwt/grpc_create_jwt.vcxproj

...creds_token/grpc_print_google_default_creds_token.vcxproj