Removed debug messages in libvirt event handling.

        h = LoopHandler(self.loop, handle_id, fd, events, cb, opaque)

        h.start()

        self.handles[handle_id] = h

        logger.debug('Add handle %d fd %d events %d', handle_id, fd, events)

        # logger.debug('Add handle %d fd %d events %d', handle_id, fd, events)

        return handle_id

    def add_timer(self, interval, cb, opaque):

        h = LoopTimer(self.loop, timer_id, interval, cb, opaque)

        h.start()

        self.timers[timer_id] = h

        logger.debug('Add timer %d interval %d', timer_id, interval)

        # logger.debug('Add timer %d interval %d', timer_id, interval)

        return timer_id

    def update_handle(self, handle_id, events):

        h = self.handles.get(handle_id)

        if h:

            h.events = events

            logger.debug('Update handle %d fd %d events %d', handle_id, h.fd, events)

            # logger.debug('Update handle %d fd %d events %d', handle_id, h.fd, events)

    def update_timer(self, timer_id, interval):

        """Change the periodic frequency of the timer.

        h = self.handles.pop(handle_id, None)

        if h:

            h.stop()

            logger.debug('Remove handle %d', handle_id)

            # logger.debug('Remove handle %d', handle_id)

    def remove_timer(self, timer_id):

        """Stop firing the periodic timer.

        t = self.timers.pop(timer_id, None)

        if t:

            t.stop()

            logger.debug('Remove timer %d', timer_id)

            # logger.debug('Remove timer %d', timer_id)

    def register_callbacks(self, *callbacks):

        """Register a callback."""