udev 092, 097, 100: Stop booting semi-configured system in case of random miniscule...

udev 092, 097, 100: Stop booting semi-configured system in case of random miniscule errors.
* It makes *completely* no sense to just fail the udev script on first error
and continue boot further. Either it should try to ignore them, or halt system
boot. Otherwise, system in weird, semi-working state will emerge, without anu
notices of such state.
* This script for example fails on mount --bind and mount --move, which busybox
1.2.1 doesn't appear to handle correctly.