Move all overlay contents to a rootfs subdirectory, which was already
supported, and set ownership to root:root.
Closes#1078
Signed-off-by: Jonathon Anderson <janderson@ciq.com>
The hosts file man page (`man hosts`) states:
> This file is a simple text file that associates IP addresses with
> hostnames, one line per IP address. For each host a single line should
> be present with the following information:
>
> IP_address canonical_hostname [aliases...]
As such, it seems that the hostname should be first in the list.
This is particularly true for the `warewulf` alias for the server
itself, which is certainly an alias for the canonical hostname.
Signed-off-by: Jonathon Anderson <janderson@ciq.co>
