Make google-auth an optional dependency

[dblackdblack]

This is a dupe of https://github.com/kubernetes-client/python/issues/1486 which was closed but which was never tackled. Feel free to re-open that one and close this one

What is the feature and why do you need it:

From what I can gather, google-auth is only required when using the google cloud platform.

Since it's of use only to a subset of the users, I propose that that dependency gets moved from the general requirements to the extras part of the setup.py file. Users that require this feature would install the package using, for example, a "gcp" extras flag (e.g. pip install kubernetes[gcp]).

In corporate environments, where compliance regulations require tracking and justifying all packages installed, this would reduce the maintenance burden by removing a whole section of the dependency tree when it's not needed.

Describe the solution you'd like to see:

Only install google-auth if it's needed by having e.g. a kubernetes[gcp] variant of the kubernetes package.

[roycaihw]

@dblackdblack Would you like to send a PR? Thanks

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/lifecycle stale

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/lifecycle rotten

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to this:

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

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Reopen this issue with /reopen
• Mark this issue as fresh with /remove-lifecycle rotten
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/close not-planned

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