A Queens man caught preparing for a 9/11 anniversary suicide bomb attack on the subways under Grand Central will soon walk out of prison thanks to a sentence that amounts to his time already served, a judge ruled Thursday. Najibullah Zazi, 33, had faced up to life in prison after his 2009 arrest, but spent nearly the next 10 years cooperating against al Qaeda. Thursday’s 10-year sentence - which, given his good behavior behind bars, means he will be sprung any day now - came at the urging of prosecutors, who cited his extensive cooperation in arguing that he deserved...