Fix error when senlin do health check a cluster
Fix error when senlin do health check a cluster

When cluster doing resize/scale create nodes, and physcical id of this nodes
not found. And cluster was attached a policy health check will do health check cluster.
So on, cluster being recover that nodes and emit error log on senlin-engine.log

Change-Id: Icece85bd60faa8b9f2fd18bfe953ebeed91f0091

stackforge/senlin,openstack/senlin,openstack/senlin,stackforge/senlin,openstack/senlin