Automatically handle broken /etc/hostname and /etc/resolv.conf

[cgwalters]

See containers/buildah#4242 (comment) and https://gitlab.com/fedora/bootc/tracker/-/issues/25

I think we can safely change bootc to just work around these on import time. The downside is we create drift between the container rootfs and what is visible at runtime, but I think it's worth it for this.

[allisonkarlitskaya]

This is interesting.

I accidentally worked around this in the composefs-rs examples by including extra/etc/resolv.conf -> ../run/systemd/resolve/stub-resolv.conf in a directory that gets added to the container via COPY. This produces a correct image, so we need to be careful: we shouldn't just blanket delete these files.