The parent company of Burger King is buying out its biggest franchisee in the U.S. for about $1 billion and will renovate hundreds of its locations.Restaurant Brands International Inc. will acquire all of the issued and outstanding shares of Carrols Restaurant Group Inc. that it doesn’t already hold for $9.55 per share.Syracuse, New York-based Carrols runs 1,022 Burger King restaurants in 23 states, or about 15% of all U.S. Burger King locations. It also owns and operates 60 Popeyes restaurants....