@param resolv: Filename to read and parse as a resolver(5)
            configuration file.

        @type timeout: Sequence of C{int}
        @param timeout: Default number of seconds after which to reissue the
            query.  When the last timeout expires, the query is considered
            failed.

        @param reactor: A provider of L{IReactorTime}, L{IReactorUDP}, and
            L{IReactorTCP} which will be used to establish connections, listen
            for DNS datagrams, and enforce timeouts.  If not provided, the
            global reactor will be used.

        @raise ValueError: Raised if no nameserver addresses can be found.
        Nr