'Reboot a system that has power management configured.
@param System system Cobbler system
@param str user power management user
@param str password power management password
@param Logger logger logger'

def reboot(self, system, user=None, password=None, logger=None):

    self.power_off(system, user, password, logger=logger)
    time.sleep(5)
    self.power_on(system, user, password, logger=logger)
