Fixed node deletion logic
Fixed node deletion logic

The invocation of set_status() may have a similar effect as node_delete,
however, it cannot reduce the cluster size as expected.  We must avoid
that.

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