Comment 1 for bug 1524627

The problem is in virt/libvirt/driver.py, _get_guest_config_meta, it gets the nova owner meta from current context. But if the instance is rebooted as other context, it will go wrong. I think we can add the identity cache to instance like network info. If this, we must change the db table. So I think we should implement it as a bp not a bug.