By Farah Master HONG KONG (Reuters) – Malaysian group Genting has emerged as a strong contender to unseat an incumbent Macau casino operator for a new license, analysts and executives say, unleashing possibly the biggest shakeup in the world’s largest gambling hub in over two decades. Only six slots will be available for the seven applicants, Macau’s government has said, as Genting Malaysia goes head-to-head with the six concessionaires Sands China, Wynn Macau, Galaxy Entertainment, MGM China, Melco Resorts and SJM Holdings as their concessions expire at year-end. Headed by Malaysian Chinese b…