Mark ksmtuned as conflicting service in the init file

MoM and ksmtuned fight over control of ksm when running at the
same time. MoM is the prefered manager now so ksmtuned should
be stopped during VDSM startup. VDSM can start ksmtuned again
when needed (in case MoM is not available or fails).

Change-Id: Iaaf8fd5f9dd3d92ef3d06b433312d5d22b594191
Resolves: rhbz#987926
Signed-off-by: Martin Sivak <msivak@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/17299
Reviewed-by: Dan Kenigsberg <danken@redhat.com>