I bumped by accident on https://gerrit.ovirt.org/#/c/102698/
py3: mkimage: Remove md5 part in getFileName

and I don't think it is right: if a VM is created in a 4.3 cluster and then migrated to a 4.4 cluster, qemu would not find the ISO image where it expects it, and it would break.

I don't recall WHY we had md5 included into the path. It may well has been a mistake. I just do not see a (easy) backward-compatible way to drop it now.