Disconnects the user currently logged-in
        :param ip_addr: the ip address of the client, that will be logged

def disconnect_user(self):
        """
        Disconnects the user currently logged-in
        :param ip_addr: the ip address of the client, that will be logged
        """
        if self.session_logged_in():
            self._logger.info("User %s disconnected - %s - %s - %s", self.session_username(), self.session_realname(), self.session_email(), web.ctx.ip)
        self._destroy_session()