Divisor resource.Quantity omitempty doesn't make sense

[regnaio]

https://github.com/kubernetes/api/blob/master/core/v1/types.go#L2309

When you json.Marshal() a ResourceFieldSelector with undefined Divisor, you get divisor: "0"

This is bad for 2 reasons:

1. omitempty is meaningless here
2. According to the docs, Divisor should default to 1. Since it actually defaults to 0, you get unintended behavior and incorrect results

Divisor instead should be a pointer *resource.Quantity instead of just resource.Quantity

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[ciphx]

/assign

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

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• Mark this issue as fresh with /remove-lifecycle rotten
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/lifecycle rotten