NEW YORK (AP) — Mike Boynton couldn’t remember such a complete win. Kermit Davis was unable to recall such an across-the-board loss. Call it opposite sides of the same coin. “Tonight was a good night to be a Cowboy,” Boynton said after Oklahoma State routed Mississippi 78-37 in the championship game of the NIT Season Tip-Off on Friday night at the Barclays Center. Cameron McGriff scored 15…