Set auth_uri for keystoneclient authtoken

Updates are authtoken middleware settings so we configure auth_uri.
This resolves several log WARNINGs that appear when the config
isn't set.

Ideally keystoneclient would set auth_uri automatically.
A known issue...  see keystone bug #1207517

Change-Id: I0b8ce0a52d1c094c18aae85f76acf5fc33b814b7
Merge "Set auth_uri for keystoneclient authtoken"