Merge remote-tracking branch 'upstream/master' into fix_gprc

README.md

composer.json

doc/core/pending_api_cleanups.md

doc/cpp/pending_api_cleanups.md

doc/interop-test-descriptions.md

examples/php/composer.json

include/grpc++/impl/codegen/client_context.h

include/grpc/impl/codegen/grpc_types.h

src/compiler/README.md

src/compiler/csharp_generator.cc

src/core/README.md

src/core/ext/client_config/client_channel.c

src/core/ext/client_config/lb_policy.h

src/core/ext/lb_policy/grpclb/grpclb.c

src/core/ext/lb_policy/pick_first/pick_first.c

src/core/ext/lb_policy/round_robin/round_robin.c

src/core/ext/load_reporting/load_reporting.h

src/core/ext/load_reporting/load_reporting_filter.c

...ext/transport/chttp2/server/secure/server_secure_chttp2.c

src/core/ext/transport/cronet/transport/cronet_transport.c