Do not close whole websocket when v5 protocol is supported

[CGNonofr]

Recently the v5.channel.k8s.io was implemented allowing to close exec streams.

But the close still closes the whole websocket when the stdin is closed

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: CGNonofr
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[k8s-ci-robot]

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[brendandburns]

Thank you for the fix! This should probably be ported to release-1.x branch also.

[brendandburns]

Also we need you to sign the CLA.

[CGNonofr]

Also we need you to sign the CLA.

I looks like a really heavy process for a so small change, I'm not sure I want to provide my mailing address either.

I authorize you to close that PR and open one of yours with the fix!