Add new flag to allow CA as text argument for kubelet client

[csauoss]

What this PR does / why we need it:

• This PR adds support for new flag --kubelet-certificate-authority-text to allow passing CA as text for kubelet client. Added corresponding unit tests and updated docs.
• Also corrected the flag name in an existing test case

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #1256

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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Hi @csauoss. Thanks for your PR.

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[dgrisonnet]

/assign /triage accepted /ok-to-test

[csauoss]

@dgrisonnet I do not quite understand the check that failed here as part of build. Is there anything I need to setup? Thanks!

[dgrisonnet]

It sounds like an unrelated error.

/retest

[csauoss]

@dgrisonnet thanks for retesting it. Looks like its all good. can you please review and approve it when you get a chance? thanks!

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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.

In response to this:

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

This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/close

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