SENDAI, Japan (Reuters) - Seiji Sasa hits the train station in this northern Japanese city before dawn most mornings to prowl for homeless men. He isn’t a social worker. He’s a recruiter. The men in Sendai Station are potential laborers that Sasa can dispatch to contractors in Japan’s nuclear disaster zone for a bounty of $100 a head. “This is how labor recruiters like me come in every day,” Sasa