Allow update inplace for allowed_address_pairs

This patch allows to do update inplace for allowed_address_pairs
properties. Scenario mentioned in bug works correct now.

Also add couple fixes to related test:
- Add explicit translation name to string, otherwise it returns objects,
  that raise error during resolving Property name, which should be a
  string.
- Add check, that update of any of mentioned properties does not cause replace.

Change-Id: I913fd36012179f2fdd602f2cca06a89e3fa896f3
Closes-Bug: #1623821
(cherry picked from commit 353e7319db)

heat/engine/resources/openstack/neutron/port.py

@@ -250,7 +250,8 @@ class Port(neutron.NeutronResource):
                         ]
                     ),
                 },
-            )
+            ),
+            update_allowed=True,
         ),
         VNIC_TYPE: properties.Schema(
             properties.Schema.STRING,

heat/tests/openstack/neutron/test_neutron_port.py

@@ -933,7 +933,7 @@ class UpdatePortTest(common.HeatTestCase):
                          return_value=fake_groups_list)
 
         props = {'network_id': u'net1234',
-                 'name': utils.PhysName(stack.name, 'port'),
+                 'name': str(utils.PhysName(stack.name, 'port')),
                  'admin_state_up': True,
                  'device_owner': u'network:dhcp'}
 
@@ -970,6 +970,15 @@ class UpdatePortTest(common.HeatTestCase):
                                                update_props)())
 
         update_port.assset_called_once_with(update_dict)
+
+        # check, that update does not cause of Update Replace
+        create_snippet = rsrc_defn.ResourceDefinition(port.name, port.type(),
+                                                      props)
+        after_props, before_props = port._prepare_update_props(update_snippet,
+                                                               create_snippet)
+        self.assertIsNotNone(
+            port.update_template_diff_properties(after_props, before_props))
+
         # update with empty prop_diff
         scheduler.TaskRunner(port.handle_update, update_snippet, {}, {})()
         self.assertEqual(1, update_port.call_count)