NEW YORK — A prominent baseball agent said players are angered over the slow free-agent market and suggested they consider boycotting spring training. Brodie Van Wagenen, co-head of CAA Baseball, floated the idea in a statement released Friday, less than two weeks before spring training workouts are to start in Florida and Arizona. He also raised the possibility of a collusion grievance, as did another agent, Seth Levinson of Aces. “The players are upset. No, they are outraged.