Adding pkgs version details to POWERKVM os

In getCaps vdsm does not report about qemu-* libvirt mom and kernel rpms
versions over PPC arch.
Same as other rhel\fedora dists, the rpms are named the same.
Therefore this patch adds the same handling to POWERKVM arch.

Change-Id: Id46249d8a2b5a492f425cced5af5bcfa630f39ae
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1151488
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/34038
Reviewed-by: Dan Kenigsberg <danken@redhat.com>