Systemd port for OpenBSD

Needs better documentation.

It is very hard to configure the built-in DHCP client inside systemd, that I'd had to turn it off and start up `dhclient` instead.

The full tgz is 827 bytes, so it looks like a just joke submission to reserve the namespace.

EDIT: it's a pony (figured it out on my Android phone)

Upvoting to see who replies before checking the attached archive.