Currently proxy binds to a random port from a port range
specified in zmq config and therefore needs to register in
redis to become visible to clients and servers.
That could be done much simpler by using a static port(s) for
proxy. Moreover zmq handles reconnect to a socket if restarted
service uses the same port number as it had before restart.
Change-Id: I088792fd08a4161d08e9160830fc3ec4d560cca4