Use assertGreater replace assertTrue

we can use assertGreater(a,b) to replace assertTrue(a>b)

Change-Id: Idd92a99bf5fd25785a47645d46bcfcad23ed870a

Author: zheng yin

openstackclient/tests/functional/identity/v3/test_project.py

@@ -66,7 +66,7 @@ def test_project_list_with_domain(self):
         items = self.parse_listing(raw_output)
         self.assert_table_structure(items, common.BASIC_LIST_HEADERS)
         self.assertIn(project_name, raw_output)
-        self.assertTrue(len(items) > 0)
+        self.assertGreater(len(items), 0)
 
     def test_project_set(self):
         project_name = self._create_dummy_project()