By Jessica Resnick-Ault (Reuters) - The U.S. Federal Trade Commission on Friday ordered 7-Eleven to sell over 200 retail outlets following its $21 billion acquisition of the Speedway fuel chain from Marathon Petroleum. Marathon Petroleum, which owned the Speedway chain, and 7-Eleven, owned by Japan's Seven & I Holdings Co Ltd, announced last month they had closed the $21 billion deal involving some 3,800 stores in 36 states. Two top FTC officials had previously said the deal was potentially illegal, Reuters reported. In a proposed consent order with the companies, the FTC said 7-Eleven and Mar...