after upgrading from 4.2 to 4.3, after a vm live migrates it's disk
images are become owned by root:root. Live migration succeeds and the vm
stays up, but after shutting down the VM from this point, starting it up
again will cause it to fail. At this point i have to go in and change
the permissions back to vdsm:kvm on the images, and the VM will boot
again.