The “T” word is getting an early start this offseason. Back during the 2006-07 season, when the 24-win Celtics were ultimately disappointed in their attempt to score a high enough draft position to pick either Greg Oden or Kevin Durant, “tank” became a league-wide joking point. When the C’s yesterday introduced three of the four players they received in exchange for Paul Pierce, Kevin Garnett and Jason Terry, that word was once again in circulation. And Keith Bogans wasn’t too happy about that. “A negative like that — tanking to lose — if I get a vibe like that in anybody’s attitude, I’m going to have an attitude,” said Bogans, who sat next to MarShon Brooks and Kris Humphries during yesterday’s press conference. The fourth former Net, Gerald Wallace, was not in attendance due to a commitment with his annual basketball camp in Alabama. Indeed, Bogans found it hard to believe that losing in the name of the lottery, even one as preordained for greatness as the 2014 draft, could even be connected to his new franchise. “It means a lot to come to a franchise with so much tradition. Let me put it this way. I played at Kentucky. I played at DeMatha (High School),” he said. “The main thing is to come out, play hard, win and hope I get the same thing from my teammates and the coaching staff. I’m not looking at this as something to look down on. I definitely want to win.