Fix incorrect authorization rule in quota contrib api.

Incorrect policy and authorization extension name in
 contrib quota api. Legacy from nova.

Change-Id: Ida8262ad63d6f881dd50a385a9913c2ed57b441c
Fixes: bug #1185974
(cherry picked from commit f7d4210d7c6c4c2f6f78f24d1681a110f49550d4)
Merge "Fix incorrect authorization rule in quota contrib api." into stable/grizzly