vdsm.config, vdscli: use function-like print statements

Get ready for python3 support, some day.

Change-Id: Iba31dd389815c192231c535f8a729d1781a27fff
Signed-off-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/34072
Reviewed-by: Antoni Segura Puimedon <asegurap@redhat.com>
Reviewed-by: Piotr Kliczewski <piotr.kliczewski@gmail.com>