Add a few maven java packages(junit, mockito) and bindings to make it possible to build grpc-java packages.
Add a few maven java packages(junit, mockito) and bindings to make it
possible to build grpc-java packages.

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