NEW ORLEANS — The old-school approaches of Georgia Southern and Appalachian State have brought a new look to the Sun Belt Conference. Relying on their ability to run the ball and play defense, the newest teams in the league quickly rose to the top of the standings last year, their first as full Division I Football Bowl Subdivision members. Georgia Southern wound up conference champs in 2014, and they were the favorite to repeat in the conference’s preseason coaches’ poll.