Issue #23277: Remove unused sys and os imports

Patch by Jon Dufresne.

Lib/test/test_importlib/extension/test_case_sensitivity.py

@@ -1,5 +1,4 @@
 from importlib import _bootstrap_external
-import sys
 from test import support
 import unittest
 

Lib/test/test_importlib/extension/test_path_hook.py

@@ -3,7 +3,6 @@ from .. import util
 machinery = util.import_importlib('importlib.machinery')
 
 import collections
-import sys
 import unittest
 
 

Lib/test/test_importlib/frozen/test_loader.py

@@ -3,8 +3,6 @@ from .. import util
 
 machinery = util.import_importlib('importlib.machinery')
 
-
-import sys
 from test.support import captured_stdout
 import types
 import unittest

Lib/test/test_importlib/import_/test_relative_imports.py

@@ -1,6 +1,5 @@
 """Test relative imports (PEP 328)."""
 from .. import util
-import sys
 import unittest
 import warnings
 

Lib/test/test_importlib/source/test_case_sensitivity.py

@@ -5,7 +5,6 @@ importlib = util.import_importlib('importlib')
 machinery = util.import_importlib('importlib.machinery')
 
 import os
-import sys
 from test import support as test_support
 import unittest