Improve handling KUBECONFIG environment variable with invalid entries

[carlossg]

Fixes #4100

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[k8s-ci-robot]

Hi @carlossg. Thanks for your PR.

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Can one of the admins verify this patch?

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: carlossg
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[medyagh]

@minikube-bot OK to test

[medyagh]

@carlossg it seems like it needs a rebase

[medyagh]

@carlossg Thank you so much for this PR ! this will make handling kubeconfig more reliable in minikube ! great work