Bump up libvirt version to fix network linking.

The libvirt feature leveraged for the Network linking feature had
a bug that made it fail when the vnic had a bootorder set. See
https://bugzilla.redhat.com/906446 . This was solved and has been marked
for backport (which did not yet happen) for the version this patch
sets).

Change-Id: Ib9e96eb0192fbea35d2723cafbec145b629371fa
Signed-off-by: Antoni S. Puimedon <asegurap@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/11600
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Tested-by: Dan Kenigsberg <danken@redhat.com>