Comment 3 for bug 1713803

At https://bugs.launchpad.net/ubuntu/+source/open-iscsi/+bug/1713537/comments/1 I described how open-iscsi (iscsi root) works with resolvconf in xenial -> zesty. We will need a solution for that path as well as 'root=squashfs:http://...../squashfs' that MAAS now uses.

It seems like we should have a general path that covers
 a.) dns working in initramfs (currently dns does not, it is missing libnss_dns.so.2)
 b.) network interfaces that are left up from initramfs getting resolvconf populated in the "real root".

My idea for this was just to have initramfs's configure_networking write a file in /run/network/ that was then read by systemd-resolved when it started.