Move endpoint policies to DocumentedRuleDefault
Move endpoint policies to DocumentedRuleDefault

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

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

Change-Id: If4807db929cc603354650b53e9e86114d225130b
Partially-Implements: bp policy-docs

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