code: def list_networks(self, org, part):
          
          if org and part:
              list_url = self._del_part + '/networks'
              list_url = list_url % (org, part)
              res = self._send_request('GET', list_url, '', 'networks')
              if res and res.status_code in self._resp_ok:
                  return res.json()
docs: Return list of networks from DCNM.
  
          :param org: name of organization.
          :param part: name of partition.