WASHINGTON - Army brass in Iraq whitewashed an incident of a soldier killed by his own lieutenant by blaming the dead hero, stonewalling his family and promoting his killer, the Daily News has learned. The friendly-fire victim, Pfc. David Sharrett, 27, of Oakton, Va., was "misidentified" by 1stLt. Timothy Hanson as an enemy gunman during a botched night raid Jan. 16, 2008, against an Al Qaeda in Iraq stronghold north of Baghdad, the Army belatedly acknowledged. Sharrett bled to death as his buddies searched frantically for him for 25 minutes after the firefight ended. For four months after the Army...