Here's a dose of reality. The father of teen sailor Abby Sunderland told The Post yesterday that he's broke and had signed a contract to do a reality show, "Adventures in Sunderland," about his family of daredevil kids weeks after she set off on her doomed and dangerous solo sail around the globe. Laurence Sunderland, a sailing instructor who lives in the middle-class Los Angeles suburb of Thousand Oaks with his pregnant wife and seven kids, opened their home to film crews four months ago. "The show might be about family, it might be about Abigail's trip. It's something that...