Use assertItemsEqual() instead of assertListEqual()

assertListEqual() is order sensitive. So we need to sort
the lists before we compare them. Use assertItemsEqual()
instead is better.

Change-Id: I9eaa98716c7401f5b099b007438acc916dae619b

Author: Tang Chen

openstackclient/tests/common/test_parseractions.py

@@ -91,11 +91,7 @@ def test_good_values(self):
             {'req1': 'aaa', 'req2': 'bbb'},
             {'req1': '', 'req2': ''},
         ]
-        # Need to sort the lists before comparing them
-        key = lambda x: x['req1']
-        expect.sort(key=key)
-        actual.sort(key=key)
-        self.assertListEqual(expect, actual)
+        self.assertItemsEqual(expect, actual)
 
     def test_empty_required_optional(self):
         self.parser.add_argument(
@@ -119,11 +115,7 @@ def test_empty_required_optional(self):
             {'req1': 'aaa', 'req2': 'bbb'},
             {'req1': '', 'req2': ''},
         ]
-        # Need to sort the lists before comparing them
-        key = lambda x: x['req1']
-        expect.sort(key=key)
-        actual.sort(key=key)
-        self.assertListEqual(expect, actual)
+        self.assertItemsEqual(expect, actual)
 
     def test_error_values_with_comma(self):
         self.assertRaises(