Otsego County notables fill the screen for “Roadhouse Coup” film By KEVIN LIMITI • Special to www.AllOTSEGO.com What are all these local dignitaries doing in a brothel in Oneonta? Cooperstown Mayor Ellen Tillapaugh, Otsego County District Attorney John Muehl, former New York State Senator James Seward, and even Oneonta Mayor-Elect Mark Drnek are all there — all with roles in a new film about a 1930s brothel-operator-turned-murderer. It’s an enthusiastically local affair. Among many others, Ben Guenther of Five Star…