Remove unused zmq relay functionality
Remove unused zmq relay functionality

Fixes bug #1188029

This relay functionality appears to be completely unused and untested
so just remove it. If we need it in future, we can restore it from the
git history.

Change-Id: I479d654aefdbd58c80946818b9a405eaa02644db

JioCloud/oslo-incubator,JioCloud/oslo-incubator,JioCloud/oslo-incubator