(Reuters) - U.S. food companies Kraft Heinz Co (KHC.O) and Mondelez International Inc (MDLZ.O) have been short-listed to participate in the second round of Campbell Soup Co’s (CPB.N) auction of its international business, people familiar with the matter said. Tins of Campbell's Tomato Soup are seen on a supermarket shelf in Seattle, Washington, U.S. February 10, 2017.