bpo-40275: Avoid importing socket in test.support (GH-19603)

* Move socket related functions from test.support to socket_helper.
* Import socket, nntplib and urllib.error lazily in transient_internet().
* Remove importing multiprocess.

1 files changed, 3 insertions, 2 deletions

diff --git a/Lib/test/test_nntplib.py b/Lib/test/test_nntplib.py
index fdd76f9e9b..2a5a0b97ee 100644
--- a/Lib/test/test_nntplib.py
+++ b/Lib/test/test_nntplib.py
@@ -10,6 +10,7 @@ import re
 import threading
 
 from test import support
+from test.support import socket_helper
 from nntplib import NNTP, GroupInfo
 import nntplib
 from unittest.mock import patch
@@ -1555,14 +1556,14 @@ class MockSslTests(MockSocketTests):
 class LocalServerTests(unittest.TestCase):
     def setUp(self):
         sock = socket.socket()
-        port = support.bind_port(sock)
+        port = socket_helper.bind_port(sock)
         sock.listen()
         self.background = threading.Thread(
             target=self.run_server, args=(sock,))
         self.background.start()
         self.addCleanup(self.background.join)
 
-        self.nntp = NNTP(support.HOST, port, usenetrc=False).__enter__()
+        self.nntp = NNTP(socket_helper.HOST, port, usenetrc=False).__enter__()
         self.addCleanup(self.nntp.__exit__, None, None, None)
 
     def run_server(self, sock):