bpo-28533: Remove asyncore, asynchat, smtpd modules (GH-29521)

Remove the asyncore and asynchat modules, deprecated in Python
3.6: use the asyncio module instead.

Remove the smtpd module, deprecated in Python 3.6: the aiosmtpd
module can be used instead, it is based on asyncio.

* Remove asyncore, asynchat and smtpd documentation
* Remove test_asyncore, test_asynchat and test_smtpd
* Rename Lib/asynchat.py to Lib/test/support/_asynchat.py
* Rename Lib/asyncore.py to Lib/test/support/_asyncore.py
* Rename Lib/smtpd.py to Lib/test/support/_smtpd.py
* Remove DeprecationWarning from private _asyncore, _asynchat and
  _smtpd modules
* _smtpd: remove deprecated properties

1 files changed, 2 insertions, 5 deletions

diff --git a/Lib/test/test_logging.py b/Lib/test/test_logging.py
index 85b6e5f3921..e709ea327fb 100644
--- a/Lib/test/test_logging.py
+++ b/Lib/test/test_logging.py
@@ -42,6 +42,8 @@ import sys
 import tempfile
 from test.support.script_helper import assert_python_ok, assert_python_failure
 from test import support
+from test.support import _asyncore as asyncore
+from test.support import _smtpd as smtpd
 from test.support import os_helper
 from test.support import socket_helper
 from test.support import threading_helper
@@ -59,11 +61,6 @@ from urllib.parse import urlparse, parse_qs
 from socketserver import (ThreadingUDPServer, DatagramRequestHandler,
                           ThreadingTCPServer, StreamRequestHandler)
 
-with warnings.catch_warnings():
-    warnings.simplefilter('ignore', DeprecationWarning)
-    import asyncore
-    import smtpd
-
 try:
     import win32evtlog, win32evtlogutil, pywintypes
 except ImportError: