CARLOS VEGA is a veteran homicide prosecutor, putting scumbags behind bars, sometimes for life. His latest high-profile case: Antonio Rodriguez, the so-called Kensington Strangler, who was convicted Thursday of three counts of first-degree murder, rape and related offenses in the deaths of three women.  With his high-pressure job and a daughter who lives at home, you'd think Vega wouldn't have time for anything else.  But his city salary hasn't been enough to give his daughter and son the schooling he wanted for them. So, for 14 years, he's been juggling two jobs. His second gig? He's a UPS supervisor.  In fact, Vega is one of several prosecutors in the city who have taken on second jobs to make ends meet. Others have been bartenders or waiters. One assistant district attorney recently moved back into her parents' house.
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