Fixed errors in policy-detach
Fixed errors in policy-detach

The original idea was to process a list of returned values in batch. It
turned out to be not feasible because list cannot be deleted using the
existing APIs.  Anyway, we should have only one result in all
possibilities.

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