We don’t know how they did it. But we know what they’ve done. Spring training opens in less than three weeks, and no one wants Bryce Harper. Or Manny Machado. At least no one wants them very much. What you hear all over baseball is the sound of one hand clapping as owners back-slap each other quietly for their marvelous miracle of salary subtraction. On Thursday, the Los Angeles Dodgers signed right-handed-hitting free agent outfielder A.J. Pollock for $55 million guaranteed for four years. That’s another door slamming on Harper. That Dodger trade of Yasiel Puig last month was done...