CHICAGO – When Ukko-Pekka Luukkonen surveys Buffalo’s goaltending depth chart, the 18-year-old Finn sees an opportunity. With Cal Petersen passing on the Sabres, the team wants another strong netminding prospect to fill the void. So in the second round Saturday, 54th overall, the Sabres selected Luukkonen at the NHL Draft. “Of course, it’s a great