Move auth to DocumentedRuleDefault
Move auth to DocumentedRuleDefault

A new policy class was introduce that requires
additional parameters when defining policy objects.

This patch switches our auth policy object to
the policy.DocumentedRuleDefault and fills the
required policy parameters as needed.

[0] I2b59f92545c5ead2a883d358f72f3ad3b3dfe1a6

Change-Id: Ie4e353149a3827f9e9beede920c8db5eb62aa003
Partially-Implements: bp policy-docs

ilay09/keystone,ilay09/keystone,openstack/keystone,rajalokan/keystone,openstack/keystone,mahak/keystone,mahak/keystone,rajalokan/keystone,ilay09/keystone,mahak/keystone,openstack/keystone,rajalokan/keystone