Mike D'Antoni's offense was as spectacular against the Suns as it used to be with them. And after watching his team blow it open early and pour it on late, he was able to relax in the final minutes for one of the few times since he left Phoenix. Danilo Gallinari had 27 points and 10 rebounds, and the New York Knicks beat the Suns 126-99 on Tuesday night, snapping a five-game losing streak…