Don't require in-place MAC address update

Previously, we checked that when updating the MAC address that the port
was updated in-place. However, this only works because the port isn't
attached to anything. In a more realistic scenario, updating in-place
actually fails. Remove this check to allow changing the Heat code to
replace the port when the MAC changes.

Change-Id: Ie8dd18d77a98a345d9129e4e8cb1a027f4cfdf60
Task: 33766
diff --git a/heat_tempest_plugin/tests/functional/test_create_update_neutron_port.py b/heat_tempest_plugin/tests/functional/test_create_update_neutron_port.py
index eeeabf3..cf51bbd 100644
--- a/heat_tempest_plugin/tests/functional/test_create_update_neutron_port.py
+++ b/heat_tempest_plugin/tests/functional/test_create_update_neutron_port.py
@@ -100,6 +100,5 @@
         new_id, new_ip, new_mac = self.get_port_id_and_outputs(
             stack_identifier)
         # mac_address should be different
-        self.assertEqual(_id, new_id)
         self.assertEqual(_ip, new_ip)
         self.assertNotEqual(_mac, new_mac)