[issue31258] [2.7] Enhance support reap_children() and threading_cleanup()

[STINNER Victor]

STINNER Victor added the comment:

Using PR 3182, test_socketserver fails with --fail-env-changed because of bpo-31151 "socketserver.ForkingMixIn.server_close() leaks zombie processes".

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<http://bugs.python.org/issue31258>
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