It was easy for director David Leitch to get Brad Pitt on board for “Bullet Train.” Long before they teamed up for the new action-comedy, Leitch was Pitt’s stunt double in some of the actor’s biggest movies, including “Fight Club” and “Troy.” Leitch has since established himself as a leading director of big-budget action films, and as soon as he sent the raucous “Bullet Train” script to Pitt, it was full speed ahead. “It was really beautiful to come full circle,” Leitch told the Daily News. “Brad had seen my work as a filmmaker, and even though we’ve now spent 20 years apart from the time I us…
