It’s going on 40 years since the NHL last celebrated a three-peat Stanley Cup champion as part of the New York Islanders’ run of four straight titles from 1980-83. The Lightning have won two straight, and defenseman Victor Hedman doesn’t see why Tampa Bay can’t make it three in a row despite another offseason of salary cap-forced subtractions. “We’re not satisfied,” Hedman said. “We don’t want to see anybody else raising that Cup, that’s for sure.” With several Eastern Conference teams such as the Islanders, Carolina, and Florida—all three lost to Tampa Bay in the playoffs last season—poised to close the gap, the reality is this season’s Cup still runs through “Champa Bay.” Though the Lightning were forced to unload their entire third line, while plugging holes with modestly priced veterans, captain Steven Stamkos believes the team’s window of opportunity hasn’t shut yet, especially if the salary cap begins nudging …