Fix incorrect attribute name in matchmaker_redis
Fix incorrect attribute name in matchmaker_redis

Pass the correct base class attribute name for host topic to
self.register and fix the AttributeError.

Change-Id: Idfe94dd37cdba9f498f79cf87d4fff81e7c4249b
Closes-Bug: #1246308

dims/oslo.messaging,magic0704/oslo.messaging,magic0704/oslo.messaging,stevei101/oslo.messaging,apporc/oslo.messaging,zhurongze/oslo.messaging,isyippee/oslo.messaging,ozamiatin/oslo.messaging,stevei101/oslo.messaging,isyippee/oslo.messaging,ozamiatin/oslo.messaging,apporc/oslo.messaging,dukhlov/oslo.messaging,dims/oslo.messaging,hkumarmk/oslo.messaging,zhurongze/oslo.messaging,hkumarmk/oslo.messaging,dukhlov/oslo.messaging