Refactor module functional test

Combine "test_module_list_no_options" and "test_module_list_with_all_option"
into one test, and modify the test for "--all' option.

Change-Id: If4e7a73502a888c50de17ec19ef7e8d02dd23f1d

Author: zhiyong.dai

openstackclient/tests/functional/common/test_module.py

@@ -29,12 +29,15 @@ class ModuleTest(base.TestCase):
             'os_client_config',
             'keystoneauth1']
 
-    def test_module_list_no_options(self):
-        json_output = json.loads(self.openstack('module list -f json'))
+    def test_module_list(self):
+        # Test module list
+        cmd_output = json.loads(self.openstack('module list -f json'))
         for one_module in self.CLIENTS:
-            self.assertIn(one_module, json_output.keys())
-
-    def test_module_list_with_all_option(self):
-        json_output = json.loads(self.openstack('module list --all -f json'))
-        for one_module in (self.CLIENTS + self.LIBS):
-            self.assertIn(one_module, json_output.keys())
+            self.assertIn(one_module, cmd_output.keys())
+        for one_module in self.LIBS:
+            self.assertNotIn(one_module, cmd_output.keys())
+
+        # Test module list --all
+        cmd_output = json.loads(self.openstack('module list --all -f json'))
+        for one_module in self.CLIENTS + self.LIBS:
+            self.assertIn(one_module, cmd_output.keys())