Fix a bug in event module
Fix a bug in event module

Closes-Bug: #1451374
Change-Id: I34b62b6932dfc19938db4445e511602bcd07a9ce

Alzon/senlin,stackforge/senlin,openstack/senlin,Alzon/senlin,tengqm/senlin-container,tengqm/senlin-container,stackforge/senlin,openstack/senlin,openstack/senlin