WIP: Topology updater: TM policy from configz endpoint

[Tal-or]

Build on top of #525 and #528

This patch allows nfd-master to pull the config from the Kubernetes configz endpoint.
This update introduces --obtain-kubelet-config=<option> as it provides the option to obtain Kubelet config from configz-endpoint in addition to the already existing way of obtaining kubelet-config-file.

Design Document: here
Issue: #333
Documentation: #526

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Tal-or
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[k8s-ci-robot]

Hi @Tal-or. 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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[Tal-or]

/retest

[k8s-ci-robot]

@Tal-or: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[Tal-or]

I signed it

[Tal-or]

/check-cla

[Tal-or]

I signed it

[marquiz]

Hmm, I'm not sure about this one 🧐 Is the configz endpoint something that is meant for production use? Also, I'd like to limit the access to the kubernetes api

[marquiz]

Please rebase

/ok-to-test

[k8s-ci-robot]

@Tal-or: PR needs rebase.

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[catblade]

@Tal-or is this one abandoned?

[Tal-or]

Closing this PR for now, due to what mentioned here and time constraints.

I will issue a new PR in the future if there will be a justification for that.