It has come to this: Music legend Elton John is using music legend Whitney Houston as a cautionary tale for addiction. In an interview with "E! News," the 65-year-old told David Burtka that his proudest accomplishment in life was not his six Grammy Awards, but getting sober in 1990. "I would not be the person I am today [if I hadn't]. I wouldn't have [son] Zachary, I wouldn't have [husband] David [Furnish]. I wouldn't have anything. I'd probably be dead," he says in the on-camera interview. Elton...