Until the policy changes land for Nova, Glance, etc, this
value is not used. Additionally, by having it set, it actually
makes it hard/impossible for the required changes to land in
the other services. Disable/comment out the changes in the
Keystone specific lib file for now, and we will re-enable once
the Services can make use of them.
Change-Id: Ia1de9083c21107dac2f0abb56bda166bdb37a69d