So far we've only formatted it for virtio-blk-pci and
virtio-blk-ccw, but other virtio-blk devices also support
the corresponding option; moreover, we've always formatted
it for all virtio-scsi devices.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>