Adding reconfigure libvirt to vdsm upgrade flow

After upgrade vdsm and supervdsm should restart if ran (due to code upgrade).
libvirt configure should run if needed, and if reconfigure occurred we
should restart libvirt service as well if it was up.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1019200
Change-Id: I89c5c0b657e5647abe2df5008bf24819a9c13f7b
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/20394
Reviewed-by: Dan Kenigsberg <danken@redhat.com>