Adds a Quotas client for Nova

* Adds a client for the 'os-quota-sets' extension
* Adds basic Admin and non-admin tests for GET and PUT operations for the
Quotas API
* Adds some tests to check Quota enforcement for create server (bug 1034453)

Fixes LP Bug #1040760
Fixes LP Bug #1034453
Change-Id: I7eb0041dbc80d8733bb2df54e4fc4755cfe9ae9c
9 files changed