Enhance RunPylint to use white_list and black_list arguments.

PRESUBMIT.py

Index: PRESUBMIT.py
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index d66f5a80b649c1260f5b502269f7d33d4b84edf3..99c7c36b5e292d9586e07e31f78a560291740fbd 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -27,17 +27,14 @@ def CommonChecks(input_api, output_api):
       UNIT_TESTS))
   output.extend(WasGitClUploadHookModified(input_api, output_api))
 
-  def filter_python_sources(affected_file):
-    filepath = affected_file.LocalPath()
-    return ((filepath.endswith('.py') and
-             filepath != 'cpplint.py' and
-             not filepath.startswith('tests')) or
-            filepath == 'git-try')
-
+  white_list = [r'.*\.py$', r'.*git-try$']
+  black_list = list(input_api.DEFAULT_BLACK_LIST) + [
+      r'.*cpplint\.py$', r'.*git_cl_repo.*']
   output.extend(input_api.canned_checks.RunPylint(
       input_api,
       output_api,
-      source_file_filter=filter_python_sources))
+      white_list=white_list,
+      black_list=black_list))
   return output