A seven-bout preliminary card for Bellator MMA’s first event of 2015, “Bellator: Pitbull vs. Straus,” is now official with the middleweights Dustin Jacoby (10-4) vs. John Salter (10-3), a 220-pound catchweight contest of Hector Carillo (5-6) vs. Everett Cummings (8-0), lightweights Steve Kozola (4-0