NONFICTION Few homeowners facing foreclosure have had the opportunity to share their financial travails privately with Alan Greenspan, the former chairman of the Federal Reserve. In fact, as Edmund L. Andrews writes in his cautionary book, “Busted: Life Inside the Great Mortgage Meltdown,“ he may be the only one. Of course, Andrews approached Greenspan as an economics reporter for The New York Times, not as a troubled homeowner, which may explain Greenspan’s reaction.