Comment 15 for bug 1787910

The flavor override code in nova is here:

https://github.com/openstack/nova/blob/cc436c2b2a2dad974c4d28871851a456ebd80e48/nova/scheduler/utils.py#L220

Which was changed from this:

https://review.openstack.org/#/c/515223/12/nova/scheduler/utils.py@a224

It's possible that regressed some override functionality - it's not easy to parse what this is doing without looking at tests, and I'm not sure we have any functional tests in nova that rely on this behavior (we definitely should if we don't).