Rick Barnes and John Calipari have been lifelong coaching friends, first meeting in 1975 while working together at a basketball camp at the University of Pittsburgh. Nearly five decades later, they’re still kicking atop the sport as legendary coaches and friendly foes in the SEC — albeit with a new twist. They’re no longer leading the bitter rivalry between Kentucky and Tennessee, where Barnes finished with an 11-10 final record against Calipari wearing orange and blue. The only records that stand moving forward are the all-time head-to-head (13-12 in favor of Barnes) and the 0-0 clean slate t…