Mark the ZeroMQ driver deprecated
Mark the ZeroMQ driver deprecated

ZeroMQ driver is deprecated, as per the Dublin 2018 PTG decision:
http://lists.openstack.org/pipermail/openstack-dev/2018-March/128055.html

Change-Id: I8b66325e0cac09054232ace9aeece19de9694c13

stackforge/blazar,ChameleonCloud/blazar,stackforge/blazar,openstack/blazar,ChameleonCloud/blazar,openstack/blazar