LONDON (Reuters) - U.S. food producer Kraft Heinz Co reported higher-than-expected quarterly sales and profit on Thursday, helped by coronavirus-related stockpiling.The maker of Heinz ketchup, Kraft Macaroni & Cheese and Oscar Mayer lunch meat said first-quarter sales were $6.16 billion, slightly ahead of analysts' average estimate of $6.14 billion(4.92 billion pounds), according to IBES data from Refinitiv. Excluding hits from currency fluctuations and divestitures, organic sales rose 6.2..