Deal with grpc issue https://github.com/grpc/grpc/issues/1256 by using an explicit package to set namespace.
Deal with grpc issue https://github.com/grpc/grpc/issues/1256
by using an explicit package to set namespace.

mzhaom/trunk,mzhaom/trunk,bazelment/trunk,bazelment/trunk,duanguoxue/trunk,bazelment/trunk,duanguoxue/trunk,duanguoxue/trunk,bazelment/trunk,mzhaom/trunk