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

[Irit Katriel]

Change by Irit Katriel <iritkatriel at gmail.com>:


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keywords: +patch
pull_requests: +25451
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/26875

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<https://bugs.python.org/issue44498>
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