UPDATED, Wed. 10:10 AM: A big shake-up at Relativity today, with word coming that the employment of Co-Chief Greg Shamo is also being terminated and that billionaire Ron Burkle is taking over its sports division after its head Happy Walters was pushed out. Relativity sent out this statement as Deadline heard of yet another executive being let go: "As Relativity continues to position itself to emerge from Chapter 11, Ryan Kavanaugh has terminated the employment of both…