CLEARWATER, Fla. — It took seven years for David Buchanan to make it back to the Phillies, an odyssey that included stops in Japan and South Korea. He was gone for so long that everything, even the name of the spring-training ballpark, is different now. Well, everything except the occupant of the locker near the far door. “Aaron [Nola’s] still sitting right there,” Buchanan said Tuesday, “with the same number, doing the same thing. Just even better.” Indeed, Nola was there in 2015, alongside Buchanan in the starting rotation for the last two months of a 99-loss Phillies season. And after the 2…