[Merge] ~slingamn/software-properties:norequests into software-properties:ubuntu/master

[Shivaram Lingamneni]

I have not (to my knowledge) signed the CLA.

A similar shim is available with a Canonical copyright here as part of the "update-manager" project:

https://git.launchpad.net/ubuntu/+source/update-manager/tree/UpdateManager/Core/LivePatchSocket.py?h=ubuntu/focal

Would a patch based on this be more suitable?
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https://code.launchpad.net/~slingamn/software-properties/+git/software-properties/+merge/389182
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