code: def EnableNetworkInterfaces(
        self, interfaces, logger, dhclient_script=None):
      
      helpers.CallDhclient(interfaces, logger, dhclient_script=dhclient_script)
docs: Enable the list of network interfaces.
  
      Args:
        interfaces: list of string, the output device names to enable.
        logger: logger object, used to write to SysLog and serial port.
        dhclient_script: string, the path to a dhclient script used by dhclient.