LAS VEGAS – Norman Powell was born five days after the show “Cheers” aired for the last time. That didn’t damper Saturday afternoon’s old-school moment. The newest Bull was headed into a conference room of the Wynn hotel to meet with the media after his two-year, $45 million deal was made official 24 hours earlier, and as he entered the doorway, Hall of Fame writer Sam Smith, 78, wasn’t going to miss the obvious opportunity. “Nooooooorm!” Smith yelled, referring to the affectionate greeting the…