LOS ANGELES (Reuters) - Rapper Tip "T.I." Harris has seen and done it all - three Grammy Awards, a novel, time in jail, a fashion line, TV reality show, businessman and several movies. Now the Atlanta-based singer is dipping into comedy, appearing in the film "Identity Thief" as an armed enforcer on the trail of a character played by Melissa McCarthy who is on the run from many of those she's swindled. T.I., 32, sat down with Reuters ahead of the movie's February 8 release to talk about the film, what's left on his to-do list, and his personal views on gun control. ...