The EXPOSE options will create a local docker-proxy. This is
unnecessary with --net=host mode. The docker-proxy adds about
20 microseconds of latency. Add documentation to the specification
to indicate where to find the ports that are exposed by the
services in case someone were to desire to add EXPOSE back to
the Dockerfiles.
Change-Id: I398e922fe096d6022a2d5985bb92498f89a5ea31