Photo Illustration by Thomas Levinson/The Daily Beast/Getty/BravoWhat happens when a reality show outgrows its premise? You start arguing about the show itself. That’s what lies at the core of the rising tensions against Ariana Madix on this season of Vanderpump Rules, as these career politicians (er, reality stars) fight to preserve themselves.After two weeks of Tom Sandoval on the defense, it’s Ariana’s turn to face the music. And it starts with the machiavellian machinations of the show’s mat