Move group policies to DocumentedRuleDefault
Move group policies to DocumentedRuleDefault

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

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

Change-Id: Ia20c966f0828b4fbc5335a4811893c025d7aab2e
Partially-Implements: bp policy-docs

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