[issue33540] socketserver: Add an opt-in option to get Python 3.6 behaviour on server_close()

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

It would be great if someone(s) could give PR 6911 a review, since it is a release blocker for 3.7.0rc1.  Thanks!

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33540>
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