The stadium formerly known as Turner Field is getting a new name. Georgia State University has signed a stadium naming-rights deal with Center Parc Credit Union. GSU, a Sun Belt Conference school, has agreed to a 15-year deal worth $21.5 million with the organization that operates under Atlanta Postal Credit Union, making it one of the richest naming rights deals outside of Power Five conferences, according to Sports Business Journal. The deal is expected to be approved by the University System…