An ex-governor of the Mexican state of Jalisco was shot dead early on Friday in the bathroom of a restaurant in the beach resort of Puerto Vallarta, the latest violence to wrack a region plagued by one of the country’s most dangerous drug gangs. Jalisco state officials said former governor Aristoteles Sandoval was shot in the back by an unidentified assailant while his security detail were outside. A shootout erupted as his bodyguards began movin…