Revise authorization doc
Revise authorization doc

We are no longer encrypting things even for the trusts now. This patch
fixes the related documentation for this purpose.

Change-Id: I3c0dca959d63d949a8d7d70dcc84d9af968c50ad

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