fix(occm): Empty nodeSelector by default

[babykart]

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What this PR does / why we need it:

• keep the nodeSelector empty by default so users can easily use their own.
• add documentation in the README

Which issue this PR fixes(if applicable): fixes #2550

Special notes for reviewers:

Release note:

NONE

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: babykart / name: babykart (68ec012adc4b3dff9b8b697918909b073e5fe1ed, 30af008dcf890310f749276f64a2809d1250b500, 3c8f0d86ec7c568f3925e5b5b9521e11c46cf67f)

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Hi @babykart. Thanks for your PR.

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[zetaab]

/ok-to-test

[dulek]

@wwentland introduced this in https://github.com/kubernetes/cloud-provider-openstack/pull/2346. Why do we want to change the default again? It's possible to override this, as I indicated on the issue itself and I believe CPO is a control plane service anyway. We're also following cloud-provider-aws pattern with this: https://github.com/kubernetes/cloud-provider-aws/blob/master/charts/aws-cloud-controller-manager/values.yaml#L14-L16

This is changing a default behavior, so we can't merge this without a release note. But that being said I'm still opposed to this.

/hold for release note.

[zetaab]

yeah actually @dulek had quite good point.

/approve cancel

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PR needs rebase.

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/lifecycle stale

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closed this PR.

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/close

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