U.S. fuel retailer Pilot Travel Centers said the president of its energy business and petroleum marketing chief have left the company in the latest shakeup after Warren Buffett's Berkshire Hathaway took majority control last year. Brad Jenkins, who was president of Pilot Flying J Energy, and Bill Cashmareck, vice president of Petroleum Marketing and Business Development, are no longer with the company, it said in a statement. The company last year replaced its chief executive and finance chief with longtime Berkshire executives and released about 15 employees, mostly tied to its crude o...