Updated openstack/openstack
Project: openstack/keystone  e06df7efa091d399d8f2dd8e2d950c9ca913ca28
null
Remove unused config option auth_admin_prefix

The auth_admin_prefix was registered but never used. This change
removes it.

Change-Id: I22dd8454f10b79c57819e64bf0a274ce25b66d18