Using assertIsNone() instead of assertEqual(None)

Following OpenStack Style Guidelines[1]:
http://docs.openstack.org/developer/hacking/#unit-tests-and-assertraises
[H203] Unit test assertions tend to give better messages for more specific assertions.
As a result, assertIsNone(...) is preferred over assertEqual(...,None)

Change-Id: I83fc81bb7ea91fe63e881f49b2347ff39b9c51e7

vmware_nsx/tests/unit/dvs/test_plugin.py

@@ -290,7 +290,7 @@ class NeutronSimpleDvsTest(test_plugin.NeutronDbPluginV2TestCase):
             self.assertEqual(True, updated_net['shared'])
 
             # Update the description attribute
-            self.assertEqual(None, network['description'])
+            self.assertIsNone(network['description'])
             updated_net = self._plugin.update_network(
                 ctx, id,
                 {'network': {'description': 'test'}})

vmware_nsx/tests/unit/nsx_v/test_availability_zones.py

@@ -37,7 +37,7 @@ class NsxvAvailabilityZonesTestCase(base.BaseTestCase):
         self.assertEqual("respool", az.resource_pool)
         self.assertEqual("datastore", az.datastore_id)
         self.assertEqual(True, az.edge_ha)
-        self.assertEqual(None, az.ha_datastore_id)
+        self.assertIsNone(az.ha_datastore_id)
 
     def test_availability_zone_without_edge_ha(self):
         az = nsx_az.ConfiguredAvailabilityZone(
@@ -46,7 +46,7 @@ class NsxvAvailabilityZonesTestCase(base.BaseTestCase):
         self.assertEqual("respool", az.resource_pool)
         self.assertEqual("datastore", az.datastore_id)
         self.assertEqual(False, az.edge_ha)
-        self.assertEqual(None, az.ha_datastore_id)
+        self.assertIsNone(az.ha_datastore_id)
 
     def test_availability_fail_long_name(self):
         self.assertRaises(

vmware_nsx/tests/unit/services/flowclassifier/test_nsxv_driver.py

@@ -294,4 +294,4 @@ class TestNsxvFlowClassifierDriver(
                 self.assertTrue(mock_update_section.called)
                 section = mock_update_section.call_args[0][0]
                 # make sure the rule is not there
-                self.assertEqual(None, section.find('rule'))
+                self.assertIsNone(section.find('rule'))