EXCLUSIVE: With cameras set to roll tomorrow in New Orleans, Well Go USA and Rumble Entertainment have come aboard as producers/financiers on the Halle Berry starrer Kidnap. Luis Prieto (Pusher) is directing the action-thriller from a Knate Gwaltney script about a mother who will stop at nothing to save her abducted son. Rumble Entertainment's Gregory Chou is joining Di Bonaventura Pictures' Lorenzo di Bonaventura and Erik Howsam and Joey Tufaro of Gold Star Films as…