Add retry_on_deadlock to policy operations
Add retry_on_deadlock to policy operations

I believe that policy detach needs a retry on deadlock added to it
as it is an operation that requires the cluster to be locked.

Input on this would be helpful.

Change-Id: I5b6662e0e08f01ed720778bf3d8313a1ffe68aa9

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