Fix assertEqual arguments order(catalog, cert_setup, etc)

assertEqual method's arguments should be in
('expected', 'actual') order.

Change-Id: Id591629a10e6e82c4eb607a9994071f16dd80d8b
Partial-Bug: #1277104

HACKING.rst

@@ -30,3 +30,9 @@ Use the common logging module, and ensure you ``getLogger``::
     LOG = log.getLogger(__name__)
 
     LOG.debug('Foobar')
+
+
+AssertEqual argument order
+--------------------------
+
+assertEqual method's arguments should be in ('expected', 'actual') order.