network.api: use function-like print statements

Change-Id: I2e97a0cb2accd857fcd47e3d9165e408c017bee6
Signed-off-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/34066
Reviewed-by: Antoni Segura Puimedon <asegurap@redhat.com>