Fix info method of ListenerSetupMixin
Fix info method of ListenerSetupMixin

The listener of ListenerSetupMixin had an incorrect info implementation
that couldn't be called properly. This patch fixes the method signature.

Change-Id: I33153f04ce23474cfaffaa1db20b8582befa324d

magic0704/oslo.messaging,zhurongze/oslo.messaging,redhat-openstack/oslo.messaging,dims/oslo.messaging,dukhlov/oslo.messaging,isyippee/oslo.messaging,dukhlov/oslo.messaging,stevei101/oslo.messaging,hkumarmk/oslo.messaging,eayunstack/oslo.messaging,apporc/oslo.messaging,ozamiatin/oslo.messaging,ozamiatin/oslo.messaging,isyippee/oslo.messaging,viggates/oslo.messaging,hkumarmk/oslo.messaging,zhurongze/oslo.messaging,dims/oslo.messaging,redhat-openstack/oslo.messaging,magic0704/oslo.messaging,stevei101/oslo.messaging,apporc/oslo.messaging