Return a fresh :class:`httplib.HTTPConnection`.

def _new_conn(self):
        """
        Return a fresh :class:`httplib.HTTPConnection`.
        """
        self.num_connections += 1
        log.info("Starting new HTTP connection (%d): %s" %
                 (self.num_connections, self.host))
        return HTTPConnection(host=self.host, port=self.port)