Do param extraction only when specified (policy_list)
Do param extraction only when specified (policy_list)

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