Zmq notifier topic manip fix.
Zmq notifier topic manip fix.

The ZeroMQ driver needs to manipulate
the topic for notifications because
the period is used as a delimiter internally.

The code was already trying to perform
this modification via topic.replace,
but was not storing the result.

Change-Id: I02a174dd96ff9181f6d7460fd41434ea05fb39d4

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