bpo-29836: Remove nturl2path from test_sundry and amend the module docstring (GH-694)

The module is implicitly tested through test_urllib.
diff --git a/Lib/nturl2path.py b/Lib/nturl2path.py
index 36dc765..853e660 100644
--- a/Lib/nturl2path.py
+++ b/Lib/nturl2path.py
@@ -1,4 +1,9 @@
-"""Convert a NT pathname to a file URL and vice versa."""
+"""Convert a NT pathname to a file URL and vice versa.
+
+This module only exists to provide OS-specific code
+for urllib.requests, thus do not use directly.
+"""
+# Testing is done through test_urllib.
 
 def url2pathname(url):
     """OS-specific conversion from a relative URL of the 'file' scheme
diff --git a/Lib/test/test_sundry.py b/Lib/test/test_sundry.py
index 1fb9964..dddf326 100644
--- a/Lib/test/test_sundry.py
+++ b/Lib/test/test_sundry.py
@@ -6,8 +6,7 @@
 
 class TestUntestedModules(unittest.TestCase):
     def test_untested_modules_can_be_imported(self):
-        untested = ('bdb', 'encodings', 'formatter',
-                    'nturl2path', 'tabnanny')
+        untested = ('bdb', 'encodings', 'formatter', 'tabnanny')
         with support.check_warnings(quiet=True):
             for name in untested:
                 try: