This is the true story…of two strangers… picked to work together… and have their lives taped…to find out what happens… when people stop being polite…and start getting real. A version of those lines, read every week during the opening of MTV’s durable reality show “The Real World,” might not seem so out of place at CNN’s cantankerous panel show “NewsNight.” The series finds itself in the spotlight for something its producers have tried not to feature: a profanity-laced threat made by one of its