By Matt Martell Yankees manager Aaron Boone all but admitted the Yankees’ trade for All-Star outfielder Andrew Benintendi will push Joey Gallo out the door. View the original article to see embedded media. Welcome to The Opener, where every weekday morning during the regular season you’ll get a fresh, topical story to start your day from one of SI.com’s MLB writers. NEW YORK — Twenty minutes after the Yankees lost the second game of the Subway Series at Citi Field on Wednesday night, the YES Network’s Jack Curry reported that the Yankees were acquiring Royals outfielder Andrew Benintendi in ex…