Add nss-lookup to the systemd Wants targets

[johnmaguire]

This builds on #791 but hits two more .service files in the repository. Thanks @Fale! edit: #791 updated.

I did notice that there are some other differences in these files:

• example and ansible scripts do not reference network-online.target, unlike Arch and Fedora.
• Arch and ansible do not have a Before=sshd.target, Fedora and example do.

[Fale]

On the network-online.target, I had the doubt that is pointless, since I would expect nss-lokup.target to be always after network-online.target. Thought, in the documentation I've not found anything that clearly states this, so I left it with the idea that worst-case is a check that always return true, since a more stricter test is ANDed to it

I don't know enough arch to say if Before=sshd.target is safe there or not, but I would assume it is.

[johnmaguire]

Good point on network-online.target. We haven't heard reports either so I'm not sweating it.

@coderobe Apologies for the random ping, but it appears you last packaged nebula for Arch. Any thoughts on the PR?

[Fale]

I've bumped #791 since I've added additional fixes.

I've gone in the rabbit hole, and I can confirm that network-online.target can happen after nss-lookup.target, and therefore in our case we need them both!