Lint bisect-related modules; obey pylint.

scripts/slave/recipe_modules/auto_bisect/api.py

Index: scripts/slave/recipe_modules/auto_bisect/api.py
diff --git a/scripts/slave/recipe_modules/auto_bisect/api.py b/scripts/slave/recipe_modules/auto_bisect/api.py
index 1332682552884e89715f40f6d169fc82d9be4387..fad63d77e5dffe3c8702308d2faf1f5d4f46ac65 100644
--- a/scripts/slave/recipe_modules/auto_bisect/api.py
+++ b/scripts/slave/recipe_modules/auto_bisect/api.py
@@ -55,14 +55,14 @@ class AutoBisectApi(recipe_api.RecipeApi):
     """Gets the particular subclass of Revision needed for the test type."""
     if test_type == 'perf':
       return perf_revision_state.PerfRevisionState
-    else: #pragma: no cover
+    else:  # pragma: no cover
       raise NotImplementedError()
 
   def gsutil_file_exists(self, path):
     """Returns True if a file exists at the given GS path."""
     try:
       self.m.gsutil(['ls', path])
-    except self.m.step.StepFailure: #pragma: no cover
+    except self.m.step.StepFailure:  # pragma: no cover
       return False
     return True