code: def add_secondary(self, address, append_lists=False):
          
          self.update(
              secondary=address,
              append_lists=append_lists)
docs: Add secondary IP addresses to this host element. If append_list
          is True, then add to existing list. Otherwise overwrite.
          
          :param list address: ip addresses to add in IPv4 or IPv6 format
          :param bool append_list: add to existing or overwrite (default: append)
          :return: None