code: def update_config(self, cluster_config, login_config):
          
  
          oldvalue = self.__update_option(cluster_config, 'ssh_to', 'ssh_to')
          if oldvalue:
              log.debug("Attribute 'ssh_to' updated: %s -> %s", oldvalue, self.ssh_to)
docs: Update current configuration.
  
          This method is usually called after loading a `Cluster`
          instance from a persistent storage. Note that not all fields
          are actually updated, but only those that can be safely
          updated.