Fix assertNotEqual parameters

One parameter shuffle for assertNotEqual was missed being
converted to ( expected, obeserved ). This patch fixes the
parameter order.

TrivialFix

Change-Id: I1a24d97b2b0fdc1c456520c917484333cf92618f

neutronclient/tests/unit/test_cli20.py

@@ -699,7 +699,7 @@ class ClientV2TestJson(CLITestV20Base):
         try:
             self.client.do_request('GET', '/test', body='', params=params)
         except exceptions.RequestURITooLong as cm:
-            self.assertNotEqual(cm.excess, 0)
+            self.assertNotEqual(0, cm.excess)
         else:
             self.fail('Expected exception NOT raised')