This adds QuotaSupport to all the drivers that don't have it, and
also updates their tests so there is at least one test which exercises
the new tenant quota feature.
Since this is expected to work across all drivers/providers/etc, we
should start including at least rudimentary quota support in every
driver.
Change-Id: I891ade226ba588ecdda835b143b7897bb4425bd8
9bcc046ffc