Buffalo Chicken Calzones with Bleu Cheese Dipping Sauce

pizza dough 1 lb boneless, skinless chicken breast, diced 2 tsp plus 1/2 cup hot pepper sauce, divided 3 tbsp butter 1 cup shredded mozzarella cheese 1 cup pizza sauce For dip: 1/3 cup bleu cheese, crumbled 1 cup sour cream