vdsm: packages: stop supervdsmd in addition to vdsmd

vdsm project introduced another independent daemon supervdsmd[1].

This daemon should be stopped explicitly during upgrade to release
vdsm resources.

No need to start supervdsmd as it will be started by vdsmd.

[1] http://www.ovirt.org/Features/Supervdsm_service

Related-To-Bug-Url: https://bugzilla.redhat.com/990517
Change-Id: I92e7baa6fade0c0d111350c8e788bbefaaa3ae17
Signed-off-by: Dan Kenigsberg <danken@redhat.com>