Close the Python sockets when the Websocket closes

[anvilpete]

What type of PR is this?

/kind bug

What this PR does / why we need it:

If the websocket connection to the k8s API server is closed for any reason, the library currently throws a WebSocketConnectionClosedException in the PortForward proxy thread and hangs.

This PR catches this exception and closes the Python-side local sockets associated with the websocket. This lets the client application detect that the connection has been interrupted.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Fixed PortForward proxy to close local Python sockets when the WebSocket closes.

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

[linux-foundation-easycla]

• ✅login: anvilpete / (3b58df2)

The committers listed above are authorized under a signed CLA.

[k8s-ci-robot]

Welcome @anvilpete!

It looks like this is your first PR to kubernetes-client/python 🎉. Please refer to our pull request process documentation to help your PR have a smooth ride to approval.

You will be prompted by a bot to use commands during the review process. Do not be afraid to follow the prompts! It is okay to experiment. Here is the bot commands documentation.

You can also check if kubernetes-client/python has its own contribution guidelines.

You may want to refer to our testing guide if you run into trouble with your tests not passing.

If you are having difficulty getting your pull request seen, please follow the recommended escalation practices. Also, for tips and tricks in the contribution process you may want to read the Kubernetes contributor cheat sheet. We want to make sure your contribution gets all the attention it needs!

Thank you, and welcome to Kubernetes. 😃

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: anvilpete
Once this PR has been reviewed and has the lgtm label, please assign roycaihw for approval. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• kubernetes/base/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[roycaihw]

/assign