This adds the quotas api from /admin to /v2 with some changes.
All users can GET /v2/quotas/<project_id>
Users with "All-Projects" permission can view other projects
(by setting X-Auth-All-Projects:True in the HTTP Headers)
Users with "All-Projects" and "set-quotas" can set other
projects quotas
Moved the API rendering to Designate Object based rendering
Change-Id: I7a0b828824ad6f274d922748f5f9a68157cd939a
Depends-On: I06180a7402fc45940d4b312666cf2dfd33af1305