Add admin role to see hidden resources

Add admin role to:

- local keystone auth API
- default auth service

to be able to see hidden resources.

Partial-Bug: #1377139
(cherry picked from commit 024279e03d9591b06948df51b4256a79a22a1a57)
Change-Id: I7e7e8cb29ae105702c7680fa7ab9fb1303ca671c
(cherry picked from commit bed9a8fc8d9d0373bb510aa3bd1a35ea5195de4b)