A maintenance worker found a grenade near the Carter Barron Amphitheater in Rock Creek Park early this morning. There’s some confusion over whether the grenade is “live” or not — the Post quotes a U.S. Park Police spokesperson as saying the grenade is genuine and not a toy, while WTOP has a source saying the grenade is live. An Army bomb squad is on the scene to deal with the device. 16th Street between Military…