Bug with accounting

[Andris Peize <andrisp_(_at_)_hipo_(_dot_)_lv>]

accounting is not stopped when system shuts down, this leads to (minor) 
filesystem corruption or so

To repeat:
enable accounting ( touch /var/account/acct ; accton /var/account/acct )
reboot few times.

Sometimes at reboot it will bail out to kernel debugger somewhere in 
disk interrupts, > ps then shows acct still running.

Easy workaround to prevent filesystem damage is adding /usr/sbin/acct to 
/etc/rc.shutdown, but this is not even close to real fix.