fix: update peers on node update

[sebltm]

Fixes https://github.com/cloudnativelabs/kube-router/issues/676 by reloading the peer configuration when nodes are updated

[aauren]

Thanks @sebltm!

I won’t be able to test this out in my setup for a week or so do to IRL complications, but I’ll give it a go as soon as I’m able to.

FWIW on the surface this seems super simple and straight forward, if it’s really this simple I’ll be face-palming that we didn’t do this earlier 🙂

[aauren]

After reviewing your change and putting it through its paces a bit, I think that this is definitely a good start, but that there is more to the story here.

From what I can tell, putting in the nrc.OnNodeUpdate(newObj) will update remote nodes, but it would not work cohesively as that won't cause the node to reload its own annotations and settings. There are a bunch of settings for the node itself that are only considered either when the Routes controller is being created (https://github.com/cloudnativelabs/kube-router/blob/master/pkg/controllers/routing/network_routes_controller.go#L1424-L1682) or when it is being started (https://github.com/cloudnativelabs/kube-router/blob/master/pkg/controllers/routing/network_routes_controller.go#L1074-L1371)

Even in the functions that nrc.OnNodeUpdate() calls, there are a few bits of logic that specifically exclude the node that it is running on from being considered: https://github.com/cloudnativelabs/kube-router/blob/master/pkg/controllers/routing/bgp_peers.go#L56

I think that we're going to need a more holistic overhaul of the controller before #676 is resolved.

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