London-based sales outfit The Mise-En-Scène Company is launching international rights to “The Napa Boys ,” an ensemble comedy, at the Cannes Film Market , with the acquisition struck through Sunset Rose Pictures, the production banner of producer Mike Rosenstein. Co-written by and starring Armen Weitzman (“Veep”) and Nick Corirossi (“What We Do in the Shadows”) – Corirossi also directs – the film follows a group of friends led through wine country by a mysterious figure known only as “The