Arnold Schwarzenegger Sells Bugatti for $2.5 Million

Arnold Schwarzenegger is one happy used car salesman after someone took his Bugatti Veyron off his hands ... for about $2.5 million. We're told Arnold's 2015 Veyron -- which goes 0-60 mph in 2.5 secs -- only had about 1,000 miles on it ... so it's a…