Bug#1148905: fai-server: fai-diskimage cleanup() can rm -rf the build host's /dev when a umount fails

[Thomas Lange]

    > A minimal fix would be to stop rm crossing the mount boundary:

    >     rm -rf --one-file-system $mnt

Thanks for the detailed description. This is now applied. See
https://salsa.debian.org/fai-team/fai/-/commit/743de14d4b4dc3b2f85393e613bccf5ba8d184f6


I'm not sure if bind mounting $target/run/udev is still needed. Do you
think we can remove it from updatebase?

-- 
regards Thomas