Getty The Boston Bruins could be part of a late-summer blockbuster trade if the team is willing to move a goaltender. The Boston Bruins could pull off a late-summer blockbuster trade to land one of the most talked-about players this offseason: Erik Karlsson . The Penguins are looking to shed themselves of the final two years of Karlsson’s contract. But they also need goaltending help. So, the Bruins could make a solid trade partner by sending Joonas Korpisalo to Pittsburgh. The Penguins have