ported network_peers to database generator

[oronila]

Closes #1801

[stgraber]

I did a few tweaks on this one but I'm out of time to get this into today's release so it will go onto next month's.

The PR was missing one pretty important change, the removal of the old functions.
Once I did that, things mostly behaved but it's missing a compatible implementation of the Create logic. Getting the basics done is pretty straightforward but getting the peering+linking logic to match the old logic, that's a bit harder and not something I want to rush in hours before a release.

[stgraber]

Okay, I had to do a bunch more changes to the generator functions to get this to behave.
I still need to run this through our OVN testsuite to make sure that the peer logic actually functions.

[stgraber]

Fixed a bunch more regressions, now clearing our OVN testsuite so hopefully we're good to go with this one now.