In the aftermath of Supervalu Inc.'s multibillion-dollar deal to sell several grocery chains and an equity stake to a private-equity investor group, there are a couple obvious winners, and at least one potentially surprising one. Private equity firm Cerberus Capital Management, which leads the group that's taking control of Albertson's, Jewel-Osco and other chains, comes out looking pretty sharp, The Wall Street Journal reports. Cerberus was Supervalu's partner in a 2006 deal to acquire and split…