Newscopy: Joseph Kennedy, San Francisco's newest municipal judge, is a small, wiry man with quick motions and a compelling dedication: "I like to work with people." There's nothing Pollyanna in the way he says it. He snaps his horned-rimmed glasses from his intense face, and leans forward across his desk with its piled papers and outlines his views with clarity. KENNEDY is the second Negro to be appointed to the San Francisco bench. His appointment was announced Monday by Gov. Brown. He's long been in the forefront of civil rights groups here and nationally, and was a deputy public defender from 1955 until Brown made him an industrial accident commissioner in January. "I'm glad to be back in the court system," he said.