*_nodeselector to_nice_yaml

[noama-nv]

What type of PR is this?
/kind api-change

What this PR does / why we need it:
streamline "*_nodeselector" from string to yaml using to_nice_yaml

Special notes for your reviewer:

Does this PR introduce a user-facing change?:
NONE

refactor kubespray values of "*_nodeselector" to accept yaml format instead of string 

[k8s-ci-robot]

Hi @krembu. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: krembu
Once this PR has been reviewed and has the lgtm label, please assign yankay for approval. For more information see the Kubernetes Code Review Process.

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[yankay]

/ok-to-test

[k8s-ci-robot]

@krembu: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubespray-yamllint	f652144	link	true	/test pull-kubespray-yamllint

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[VannTen]

While it's a bit nicer, it's a breaking change and I'm not convinced this is worth it...

[k8s-ci-robot]

PR needs rebase.

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[k8s-triage-robot]

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

This bot triages PRs 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
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You can:

• Mark this PR as fresh with /remove-lifecycle stale
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/lifecycle stale