add proxy authentication supporting for websocket (stream/ws_client.py)

[itaru2622]

What type of PR is this?

/kind bug

What this PR does / why we need it:

This PR supports proxy authentication for websocket client. as described in #255, and https://github.com/ansible-collections/kubernetes.core/issues/246 current kubernets-client/python(-base) support proxy auth only for REST but NOT websocket. as the result, kubernets.core's k8s_cp nor k8s_exec cannot work with proxy when proxy requires authentication.

Which issue(s) this PR fixes:

Fixes #255 Fixes https://github.com/ansible-collections/kubernetes.core/issues/246

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

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

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[itaru2622]

/assign @roycaihw

[yliaog]

please add a test to verify the added logic works as expected.

[itaru2622]

@yliaog ok, I will add test.

[itaru2622]

@yliaog unittest code added. Could you review this PR, please.

ps. I also added small change into stream/ws_client.py to get unittest friendly.

[yliaog]

/lgtm /approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: itaru2622, yliaog

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