Merge github.com:google/grpc into qps

Makefile

examples/pubsub/publisher.h

examples/pubsub/subscriber.h

src/compiler/cpp_generator.cc

src/compiler/cpp_generator.h

src/compiler/cpp_plugin.cc

src/core/iomgr/tcp_server.h

src/core/iomgr/tcp_server_posix.c

src/core/iomgr/tcp_server_windows.c

src/core/security/server_secure_chttp2.c

src/core/surface/completion_queue.c

src/core/surface/completion_queue.h

src/core/surface/server.c

src/core/surface/server.h

src/core/surface/server_chttp2.c

src/php/bin/generate_proto_php.sh

src/php/ext/grpc/call.c

src/php/ext/grpc/channel.c

src/python/interop/interop/_interop_test_case.py

src/python/interop/interop/client.py