Comment 12 for bug 1719770

I appear to have made an oversight here in that the problem only actually exists up to Mitaka after which it was fixed as part of https://bugs.launchpad.net/nova/+bug/1692397 for which the fix was backported all the way down to stable/newton (and released to Ubuntu) back in August of this year. So, the question that remains is whether can backport this to Mitaka which I will now investigate.