Creates a UDP socket bound to any interface (empty string host address)
        but to the specified port.

def _createSocket(self, port):
        '''
        Creates a UDP socket bound to any interface (empty string host address)
        but to the specified port.
        '''
        self._logger.info(
            'Setting up UDP socket to listen to port {:}'.format(port))
        sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

        sock.settimeout(self._timeout)
        self._logger.info(
            'Successfully set socket timeout to {_timeout}'
            .format(**self.__dict__))

        sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        self._logger.info('Successfully set socket option to SO_REUSEADDR')

        sock.bind(('', port))
        self._logger.info(
            'Successfully bound socket to ("", {port})'
            .format(port=port, **self.__dict__))

        return sock