Upon share type deletion, we were leaving behind
share type quotas, usages and reservations. These
couldn't be cleaned up without resorting to manual
intervention.
Cleanup quotas when a share type is being destroyed,
since the resources that they pertained to are gone
too.
Closes-Bug: #1811680
Change-Id: I04b1fe88808596aa8c05429b964190d654587f9a
Goutham Pacha Ravi