scheduler: add tests and fix for detected host_network and to port field changes

[nickethier]

This PR changes the scheduler to detect if a to or host_network field is updated.

fixes #9728

[shoenig]

LGTM. Since this is now using a structs object, do you think it would be worthwhile to implement .Equals on it rather than continuing to lean on reflect.DeepEquals?

[nickethier]

LGTM. Since this is now using a structs object, do you think it would be worthwhile to implement .Equals on it rather than continuing to lean on reflect.DeepEquals?

I thought about this but then we'd probably need to take ordering into account where here we're really just reusing the struct as a convenient tuple and we know we don't have to worry about ordering. I can't think of a place where we would be comparing port mappings.

[github-actions]

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