drop dead ksmtuned-related code

mom has replaced ksmtuned completely, and is expected to be running
whenever Vdsm is. We can safely remove the unused ksm module.

Change-Id: I511fa1754e55076084529834fa9758c2fd139761
Signed-off-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/27026
Tested-by: Francesco Romani <fromani@redhat.com>