is specified by /etc/pam.d/init
* Move utmp/wtmp before the execvp() in spawn() to be sure to
use the correct pid even on a controlling tty
* Remaining problem is that the pid of the second fork() for
getting a controlling tty isn't that reported by spawn()
* Re-enable writting utmp/wtmp for boot scripts
* Provide a simply /etc/pam.d/init as without it will not work (sigh!)
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