[bot_update] Remove support for rietveld patches.

R=agable@chromium.org, tandrii@chromium.org

Recipe-Nontrivial-Roll: build
Recipe-Nontrivial-Roll: infra
Change-Id: I518335e7b8fdce316b5566caccd3c4c7c2ae741a
Reviewed-on: https://chromium-review.googlesource.com/960161
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
diff --git a/tests/git_cl_test.py b/tests/git_cl_test.py
index ae7621c..78e64fe 100755
--- a/tests/git_cl_test.py
+++ b/tests/git_cl_test.py
@@ -388,7 +388,7 @@
         'Cr-Branched-From: somehash-refs/heads/master@{#12}')
 
   def test_git_number_ever_moooooooore_lineage(self):
-    self.maxDiff = 10000
+    self.maxDiff = 10000  # pylint: disable=attribute-defined-outside-init
     actual = self._test_git_number(
         'CQ commit on fresh new branch + numbering.\n'
         '\n'
@@ -618,7 +618,7 @@
       expected = f.read()
     def by_line(text):
       return [l.rstrip() for l in text.rstrip().splitlines()]
-    self.maxDiff = 10000
+    self.maxDiff = 10000  # pylint: disable=attribute-defined-outside-init
     self.assertEqual(by_line(sys.stdout.getvalue().strip()), by_line(expected))