WESTPORT — Bruce Springsteen belting out the lyrics to Glory Days could be heard through the small opening in the door leading to the Staples boys lacrosse team’s locker room, which overlooks the school football field, late this afternoon. Minutes earlier, in a game given measuring-stick urgency, the Wreckers had come away with a convincing 7-3 victory over New Canaan, an FCIAC blue-blood program.