Comment 27 for bug 8509

Created an attachment (id=1302)
Diff to current init that only uses tools available in d-i's busybox

This patch adds two shell functions to deal with the problem. Marco's patch
requires the use of tsort and tac. A couple problems:

1) They're in /usr, so not necessarily available at boot time
2) They're not in busybox, so this wouldn't work for d-i.