Fix admin server doesn't report v2 support in Apache httpd

The Keystone server version response would only include v3 when
Keystone was running in Apache httpd. It should have also included
the v2.

Change-Id: Ib471539beda746d085adae1e72ab0dc1e0fb41e0
Closes-Bug: #1343579
Merge "Fix admin server doesn't report v2 support in Apache httpd"