251 [not run] FITRIM not supported on /dev/vdc
260 [not run] FITRIM not supported on /dev/vdc
288 [not run] FITRIM not supported on /dev/vdc
But 260 and 288 fail with ide disks, where discard defaults to on. The
ancient kernel in our ubuntu-12.04.qcow2 doesn't support virtio discard
anyway so let's just disable them for consistency.