Improve simulator.py
Improve simulator.py

* passing targets to rpc-client using -tg arg
so clients can send messages to different targets
* removed redis.flush_db() so we can start
several simulator processes for zmq.

Change-Id: I0d36c5d8cbec938c8fd85d1041d2a3bff02b49e5

ozamiatin/oslo.messaging,dukhlov/oslo.messaging,dukhlov/oslo.messaging,ozamiatin/oslo.messaging