Mayor Antonio Villaraigosa, signaling plans to bring change to the Port of Los Angeles, is reshaping its board of commissioners with new appointees to be named today to the five-member panel. The new slate includes a former general manager of the Department of Water and Power, a labor leader, an environmental attorney and two other lawyers, sources said Tuesday. The appointments come as the port, the nation's largest, is struggling with significant challenges, including a corruption probe, looming major expenses, security concerns, air pollution problems and major turnover among senior managers. Two of the appointments — S. David Freeman, the...