For hockey fans, there’s something depressingly familiar about the current battle between the National Hockey League and its players. The lockout, which began at the stroke of midnight on Sept. 15, is the third in the past 18 years, all of them overseen by commissioner Gary Bettman. And the issue is the same as it ever was: money. In fact, the only significant difference this time around might be who is leading the players. Donald Fehr, the new executive director of the NHL Players’ Association, led pro baseball’s union for a quarter of a century, before riding to the rescue of his defeated and demoralized hockey brethren. Tough and determined, he’s every bit as stubborn as the man he’s facing across the table.