Fixes missing admin/user for devstack plugin
Fixes missing admin/user for devstack plugin

At some point a VAR we depended on was removed or changed upstream. This
patch updates to fixes that so the users fields are populated again.

Change-Id: Ie58b478d13b758e020df0655e6e3462ab4755f9a

openstack/octavia,openstack/octavia,openstack/octavia