Merge branch 'master' of github.com:grpc/grpc into decompression

BUILD

Makefile

README.md

build.json

doc/interop-test-descriptions.md

include/grpc++/fixed_size_thread_pool.h

include/grpc++/thread_pool_interface.h

src/compiler/csharp_generator.cc

src/core/client_config/uri_parser.c

src/core/httpcli/httpcli.c

src/core/security/secure_transport_setup.c

src/core/security/secure_transport_setup.h

src/core/security/server_secure_chttp2.c

src/core/surface/secure_channel_create.c

src/cpp/server/create_default_thread_pool.cc

src/cpp/server/fixed_size_thread_pool.cc

src/cpp/server/server_builder.cc

src/csharp/Grpc.Auth/OAuth2InterceptorFactory.cs

...p/Grpc.Core.Tests/Internal/MetadataArraySafeHandleTest.cs

src/csharp/Grpc.Core/Calls.cs