More test cases for by-cluster event retrieval/counting
More test cases for by-cluster event retrieval/counting

The by-cluster accounting now supports cluster/node level events, but
not profile or policy events.  If needed, those events should be created
with cluster_id set to the appropriate cluster.

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