Issue #25487: Fix tests not updated when the imp module moved to a

DeprecationWarning.

Thanks to Martin Panter for finding the tests.

Lib/modulefinder.py

@@ -10,7 +10,7 @@ import types
 import struct
 import warnings
 with warnings.catch_warnings():
-    warnings.simplefilter('ignore', PendingDeprecationWarning)
+    warnings.simplefilter('ignore', DeprecationWarning)
     import imp
 
 # XXX Clean up once str8's cstor matches bytes.

Lib/test/test_imp.py

@@ -12,7 +12,7 @@ from test import support
 import unittest
 import warnings
 with warnings.catch_warnings():
-    warnings.simplefilter('ignore', PendingDeprecationWarning)
+    warnings.simplefilter('ignore', DeprecationWarning)
     import imp