Comment 16 for bug 1570825

This is actually nova bug https://bugs.launchpad.net/mos/+bug/1581037 Unfortunately, it marked as Won't Fix. So it was an attempt to find workaround in Heat, but it fixes the bug only partially. Sometimes cancel update is failing. I will ask nova team about status of this bug, probably they will fix it, or we will try to find new workaround or move this bug to Won't Fix.