Merge github.com:grpc/grpc into delete-the-old-api

src/core/support/cpu_windows.c

src/core/surface/call.c

src/csharp/ext/grpc_csharp_ext.c

src/python/src/grpc/_adapter/_call.h

src/python/src/grpc/_adapter/_channel.h

src/python/src/grpc/_adapter/_client_credentials.h

src/python/src/grpc/_adapter/_completion_queue.c

src/python/src/grpc/_adapter/_completion_queue.h

src/python/src/grpc/_adapter/_server_credentials.h

src/python/src/grpc/_adapter/_tag.h

src/python/src/setup.py

templates/vsprojects/Grpc.mak.template

test/core/fling/server.c

vsprojects/Grpc.mak