gh-108303: Move `smtpd` to `test.support` (#114368)

Update test_logging.py and test_smtplib.py.

Lib/test/test_logging.py

@@ -49,6 +49,7 @@ from test.support import socket_helper
 from test.support import threading_helper
 from test.support import warnings_helper
 from test.support import asyncore
+from test.support import smtpd
 from test.support.logging_helper import TestHandler
 import textwrap
 import threading
@@ -63,9 +64,6 @@ from urllib.parse import urlparse, parse_qs
 from socketserver import (ThreadingUDPServer, DatagramRequestHandler,
                           ThreadingTCPServer, StreamRequestHandler)
 
-with warnings.catch_warnings():
-    from . import smtpd
-
 try:
     import win32evtlog, win32evtlogutil, pywintypes
 except ImportError:

Lib/test/test_smtplib.py

@@ -22,10 +22,9 @@ from test.support import hashlib_helper
 from test.support import socket_helper
 from test.support import threading_helper
 from test.support import asyncore
+from test.support import smtpd
 from unittest.mock import Mock
 
-from . import smtpd
-
 
 support.requires_working_socket(module=True)