Jeremy Swayman is gearing up for the mother of all goalie reunions on Saturday. The Bruins’ netminder will faceoff against old friend and teammate Linus Ullmark, as the Ottawa Senators come to town. For the last three seasons, the pair dominated as one of the best goaltending tandems in the National Hockey League. But on Saturday, they’ll be on opposite ends of the ice, adding a new dimension to the divisional rivalry.