*_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.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.

[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]

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This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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You can:

• Mark this PR as fresh with /remove-lifecycle stale
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Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough active 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
• After 30d of inactivity since lifecycle/rotten was applied, the PR is closed

You can:

• Mark this PR as fresh with /remove-lifecycle rotten
• Close this PR with /close
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle rotten