Comment 20 for bug 1431291

There has been some work done here in liberty:

https://review.openstack.org/#/q/status:merged+project:openstack/nova+branch:master+topic:bp/no-valid-host-reporting,n,z

There is some more work that could be done, see the discussion in https://review.openstack.org/#/c/194780/ - but so far this is better than what we had.