(Reuters) - Yum Brands Inc on Monday named company veteran David Gibbs as its chief executive officer, succeeding Greg Creed, who will be retiring at the end of the year.Gibbs, 55, has been with the company since 1989, holding several senior roles including chief financial officer for three years before taking charge as chief operating officer earlier this year.Creed, who has been with Yum for 25 years, will remain as CEO through the end of 2019. He will serve as a part-time adviser next year..