PHOTO: Donnie Shell By TOM SHANAHAN Donnie Shell joined the Black College Football Hall of Fame with the Class of 2015 last week in Atlanta, but the South Carolina State alum already occupied a place in college football history. And his history is more than his four Super Bowl rings playing with the Pittsburgh Steelers. Shell, who played at South Carolina State in the earlly 1970s, and fellow NFL players from Historically Black Colleges and Universities marked the…