[systemd-devel] [RFC] sd-dhcp-server: add a basic DHCPv4 server library

[Tom Gundersen]

This is the beginning of DHCPv4 server support in networkd.

The main usecase I'm targeting is to be able to hand out DHCP
leases to containers on the local machine.

I have attempted to keep the library as minimal as possible to
make reviewing easier, but we'd abviously need a few more
features before this would be generally useful (in particular
we need to provide more options in the leases we hand out).

Feedback welcome!

Cheers,

Tom