By Ken Paulson – A sense of humor has always set the Kentucky Headhunters apart from other Southern rock bands. While others swaggered, the Headhunters did what they pleased, including covers of “The Ballad of Davy Crockett” and “Spirit in the Sky.” The Kentucky Headhunters are back with Dixie Lullabies (Red Dirt Music), a new album that’s as loose, derivative…