Comment 4 for bug 1742102

The volume create over limit is a good example. Regardless of this bug with the auto-disable stuff, it would probably be in our best interest to do a quota check in the API when we know nova is going to create the volume (which happens late in the compute service) and then we could fail fast in the server create API if we know we don't have enough volume quota for the boot from volume request. We already do a port quota check in the API during server create, so it seems we should also do that for volumes.