The jersey hung above Randy Berman’s crib. When Berman was in college, it hung above his “Kegerator.” Until three months ago, it was still hanging above the cool-beer dispenser in the 36-year-old bachelor’s Rogers Park apartment. But Berman, who goes by the nickname “Boomer,” has finally decided to part ways with the jersey, once worn by Mr. Cub, Ernie Banks. The 1968 garment is on the auction block.