Blues general manager Doug Armstrong was confident that the re-signing of his coach, Craig Berube, was going to get done, so he wasn’t concerned about getting halfway through Berube’s final season without extending the contract of the only coach to win a Stanley Cup in St. Louis. “We talked prior to Christmas, Craig and I,” Armstrong said Thursday. “There was really no feeling I think from either side that we were concerned that we weren’t gonna get something done. We talked at Christmas and said it’s probably the right time to start the discussions and I started to talk to Craig’s representat…