Message 302023 - Python tracker

While testing PR 3138 (stricter threading_cleanup) with PR 3523 (socketserver joins threads), I got the following warning:

test_listen_config_1_ok (test.test_logging.ConfigDictTest) ... Warning -- threading_cleanup() detected 1 leaked threads (count: 1, dangling: 2)
ok

Attached PR 3524 should fix this warning, once combined with PR 3523.