Tensions in Farmingville over immigration flared up yesterday as Suffolk police arrested five men and one teenage girl in two seperate incidents at a busy day laborer hiring site.In the first, classified by detectives as a hate crime, two Holtsville men threw a bottle at a day laborer, Suffolk police said. Three hours later, a heated confrontation erupted at the same location between about 20 supporters of day laborers and one resident opposed to illegal immigration.At 6 a.m., Matthew Lindstadt, 20, and James Stern, 32, lured a laborer with the promise of work to their pickup truck parked near the...