Three minor fixes:

Three minor fixes:

- Add viddev definition for serial console support.
- In moused_start, run vidcontrol only once instead of (number of
/dev/ttyv* minus 1) times.  This gets rid of a slew of redundant
boot-time error messages.
- Add moused_stop routine to kill the mouse daemon and turn off the
mouse pointer when the 'stop' argument is specified.

Submitted-by: Sascha Wildner <saw@online.de>
Tested-by: walt <wa1ter@myrealbox.com>,
           YONETANI Tomokazu <qhwt+dragonfly-submit@les.ath.cx>