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]

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[roycaihw]

/assign

[roycaihw]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: anvilpete, roycaihw

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