Black Monday's stock-market warning signal came from the bond market, and it's back, says Wall Street veteran

By Nora RedmondLarry McDonald, a former Lehman bros. trader, said bonds yields are starting to resemble their set-up during the summer of 1987.Bond yields are starting to deliver "equity-like returns" and it's bad news for the stock market, according to former Lehman Bros. trader Larry McDonald.He…