[nova][tempest] nova-next gate blocker

nova-next (and possibly others) is broken because of https://bugs.launchpad.net/tempest/+bug/1959682

The fix is at https://review.opendev.org/c/openstack/tempest/+/827305, with a Nova DNM patch to exercise it at https://review.opendev.org/c/openstack/nova/+/827306

Please hold your rechecks until this is resolved.

Cheers!