[issue44498] move deprecated asynchat, asyncore and smtpd from the stdlib to test.support

[Petr Viktorin]

Petr Viktorin <encukou at gmail.com> added the comment:

Please follow the backwards compatibility policy (PEP 387):
- Have a discussion
- Raise deprecation warnings
- Wait at least two minor Python versions where warnings are raised
- Consider any feedback
- Then remove stuff
(Or ask the SC for an exception, but these "are only granted for extreme situations such as dangerously broken or insecure features or features no one could reasonably be depending on".)

There were no deprecation warnings raised so far, so removing these in 3.11 is very premature.

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nosy: +petr.viktorin

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