Comment 18 for bug 1172808

A patch that does a partial revert of https://review.openstack.org/49455 from comment #16 and is under discussion at the time of writing so I am linking it here.

https://review.openstack.org/#/c/175742/

Basically - just checking quotas and not reserving them is a bit of a fool's errand. We should eithere have a reserve-rollback api in Neutron, or as has been suggested above - create the port quickly and then update it with additional information once we have it (when the request reaches the compute host)