Ed Schouten 4ae35b5d2a Fix the staircase issue properly this time.
Even though I thought this bug was somewhere in the TTY layer, it turns
out init(8) doesn't make sure /dev/console is opened initially properly.
I've added revoke() to two pieces of code:

- death(): Apart from killing the gettys on shutdown, this doesn't
  guarantee the TTY to be closed immediately.
- runshutdown(): Just like setctty(), we should revoke /dev/console.
  Applications like syslogd may have file descriptors to the console.
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