Added client-go auth plugins

[pyrsson]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Adds support for clusters using any of the client-go auth plugins like oidc based on these docs: client-go examples

Fixes validation of CRDs when connected to a cluster with oidc for example:

$ kubectl-validate ./test-with-crds.yaml

../test-with-crds.yaml...ERROR
failed to retrieve validator: failed to locate OpenAPI spec for GV: bitnami.com/v1alpha1
failed to retrieve validator: failed to locate OpenAPI spec for GV: bitnami.com/v1alpha1
failed to retrieve validator: failed to locate OpenAPI spec for GV: minio.min.io/v2
Error: validation failed
# with auth plugins
 $ kubectl-validate ./test-with-crds.yaml

./test-with-crds.yaml...OK

Which issue(s) this PR fixes:

Didn't open an issue, hope that's ok.

Special notes for your reviewer:

First ever contribution, please let me know if there's something I missed or need to change.

Does this PR introduce a user-facing change?

Added support for client-go auth plugins

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[linux-foundation-easycla[bot]]

• :white_check_mark:login: pyrsson / (747d5d68a5520704138e0f1563a5a9ba0f865d3e)

The committers listed above are authorized under a signed CLA.

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[eddycharly]

LGTM but i wonder if we can have a test for that 🤔

[pyrsson]

LGTM but i wonder if we can have a test for that 🤔

I could give it a go, but I'm not entirely sure what the tests should cover. My understanding is that there is fairly little value in writing tests for library functionality, but I could be wrong.

Do you have a suggestion for what to test in kubeconfig.go?

[alexzielenski]

/lgtm /approve

From a glance it looks like adding a good test for this requires infra we dont have to stand up a fake cluster requiring the plugin. Since this is a single line addition simply to link the library I think it is ok to add

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alexzielenski, pyrsson

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