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/tests/git_cl_test.py b/tests/git_cl_test.py
index 198afb1..8e43e36 100755
--- a/tests/git_cl_test.py
+++ b/tests/git_cl_test.py
@@ -115,7 +115,7 @@
 class CodereviewSettingsFileMock(object):
   def __init__(self):
     pass
-  # pylint: disable=R0201
+  # pylint: disable=no-self-use
   def read(self):
     return ("CODE_REVIEW_SERVER: gerrit.chromium.org\n" +
             "GERRIT_HOST: True\n")
@@ -142,7 +142,7 @@
                   CookiesAuthenticatorMockFactory(cookie='cookie'))
   """
   class CookiesAuthenticatorMock(git_cl.gerrit_util.CookiesAuthenticator):
-    def __init__(self):  # pylint: disable=W0231
+    def __init__(self):  # pylint: disable=super-init-not-called
       # Intentionally not calling super() because it reads actual cookie files.
       pass
     @classmethod