2010: When the producers of the CBS reality TV hit “Undercover Boss” brag that their show is about corporate presidents getting their hands dirty, they couldn’t be more accurate than this week’s episode. Because on Sunday, April 4, 2010, the boss going undercover is Rick Arquilla, president of Cincinnati, Ohio-based Roto-Rooter Services Company. That’s right, the top guy at America’s largest drain cleaning service will be shown as one of the guys, one of the grunts, repairing and snaking America