Add option to refresh gcp token when config is cmd-path

[jfrabaute]

The python client does not deal with "gcloud" gke auth in the kube config file as it's based on the "cmd-path" auth.

This is adding the code to take care of this auth.
This should solve kubernetes-client/python#754

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[yliaog]

please sign cla

[jfrabaute]

please sign cla

I'm working on it with my company right now.

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jfrabaute

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[jfrabaute]

I re-sent this PR as #175