Remove redundant output in git_cl.py tests.

R=agable@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2319903002

tests/git_cl_test.py

@@ -1957,7 +1957,10 @@ class TestGitCl(TestCase):
       'current_revision': 'deadbeaf',
     }
     cl._codereview_impl.SubmitIssue = lambda wait_for_merge: None
+    out = StringIO.StringIO()
+    self.mock(sys, 'stdout', out)
     self.assertEqual(0, cl.CMDLand(force=True, bypass_hooks=True, verbose=True))
+    self.assertRegexpMatches(out.getvalue(), 'Issue.*123 has been submitted')
 
 
 if __name__ == '__main__':