Delete some unused methods in cluster
Delete some unused methods in cluster

There are still some code not used in cluster module and the workflow of
cluster actions need a reexam.

Change-Id: If4add4663b6896f6fd21adf515b4692e23d9cd49

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