Getty Ronan Kopp could be the latest in a stable of unheralded relievers for the Dodgers. The two-time reigning World Series champion Los Angeles Dodgers do not have many holes in their opening day lineup. Yet, their bullpen still could use an extra arm or two — especially a left-hander. With that in mind, MLB.com’s Sonja Chen floated Ronan Kopp as a dark horse to make the Dodgers’ opening day lineup when they announce their roster next month. Kopp, who will turn 24 in July, was a 12th-round