By Michael O’Boyle MAZATLAN, Mexico (Reuters) – He was once on Forbes magazine’s billionaires list, but after more than a decade on the run, Mexico’s most wanted drug lord Joaquin “Shorty” Guzman was finally caught in a modest beachside condo with American retirees for neighbors. Just days after escaping from the clutches of Mexican troops through a tunnel and sewer, Guzman was fast asleep when Mexican Marines crept up on him in the decidedly unglamorous condominium in this resort city in northwest Mexico.