17 Police Officers Are Disciplined In Wake of Deadly Van Incident
New York City Police Commissioner Bernard B Kerik disciplines 17 officers in Brooklyn's 72d Precinct where Officer Joseph Gray is accused of killing four people with his minivan after marathon day of drinking with colleagues to celebrate supervisor's upcoming wedding; Kerik transfers precinct's commander, executive officer, lieutenant and two sergeants, and suspends or places on modified duty two other sergeants and 10 officers; says they drank on department property or visited topless bar that was off limits to officers from precinct; investigators say Gray and co-workers went to topless bar, and hours later his minivan struck and killed 4-year-old boy, his pregnant mother and child's aunt; say Gray ran red light, apparently en route to pick up colleague to return to work late shift; Kerik said to be livid over what he perceives to be lax supervison in precinct; Mayor Rudolph W Giuliani says officers being disciplined send message that drinking and being police officer is dangerous combination; photos (M)