depot_tools: Replace pylint error numbers with symbolic names.

This affects a bunch of files, but only changes comments,
and shouldn't make any difference to behavior.

The purpose is to slightly improve readability of pylint
disable comments.

Change-Id: Ic6cd0f8de792b31d91c6125f6da2616450b30f11
Reviewed-on: https://chromium-review.googlesource.com/420412
Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: Quinten Yearsley <qyearsley@chromium.org>
diff --git a/gclient.py b/gclient.py
index 1fed708..c1d7bc7 100755
--- a/gclient.py
+++ b/gclient.py
@@ -746,7 +746,7 @@
     return bad_deps
 
   # Arguments number differs from overridden method
-  # pylint: disable=W0221
+  # pylint: disable=arguments-differ
   def run(self, revision_overrides, command, args, work_queue, options):
     """Runs |command| then parse the DEPS file."""
     logging.info('Dependency(%s).run()' % self.name)