Issue #29142: Fix suffixes in no_proxy handling in urllib.

In urllib, suffixes in no_proxy environment variable with
leading dots could match related hostnames again (e.g. .b.c matches a.b.c).
Patch by Milan Oberkirch.
diff --git a/Lib/test/test_urllib.py b/Lib/test/test_urllib.py
index 7b1ef6a..14de91e 100644
--- a/Lib/test/test_urllib.py
+++ b/Lib/test/test_urllib.py
@@ -185,11 +185,12 @@
     def test_proxy_bypass_environment_host_match(self):
         bypass = urllib.proxy_bypass_environment
         self.env.set('NO_PROXY',
-            'localhost, anotherdomain.com, newdomain.com:1234')
+                     'localhost, anotherdomain.com, newdomain.com:1234, .d.o.t')
         self.assertTrue(bypass('localhost'))
         self.assertTrue(bypass('LocalHost'))                 # MixedCase
         self.assertTrue(bypass('LOCALHOST'))                 # UPPERCASE
         self.assertTrue(bypass('newdomain.com:1234'))
+        self.assertTrue(bypass('foo.d.o.t'))                 # issue 29142
         self.assertTrue(bypass('anotherdomain.com:8888'))
         self.assertTrue(bypass('www.newdomain.com:1234'))
         self.assertFalse(bypass('prelocalhost'))