Test port mac_address update

Adds api admin tests ``test_update_mac`` and ``test_regenerate_mac``.
Also enable the ``port-mac-address-regenerate`` extension in zuul
job.

Related-Bug: #1768690
Depends-On: I7d04beea4810718c3b745de8ea97897b1323267e
Change-Id: I285986c7a19c4804b3c8c3b0a2d2e3f895a46ff7

.zuul.yaml

@@ -16,7 +16,7 @@
       tox_envlist: all
       devstack_localrc:
         TEMPEST_PLUGINS: /opt/stack/neutron-tempest-plugin
-        NETWORK_API_EXTENSIONS: "address-scope,agent,allowed-address-pairs,auto-allocated-topology,availability_zone,binding,default-subnetpools,dhcp_agent_scheduler,dns-domain-ports,dns-integration,dvr,empty-string-filtering,ext-gw-mode,external-net,extra_dhcp_opt,extraroute,fip-port-details,flavors,ip-substring-filtering,l3-flavors,l3-ha,l3_agent_scheduler,logging,metering,multi-provider,net-mtu,net-mtu-writable,network-ip-availability,network_availability_zone,pagination,port-security,project-id,provider,qos,qos-fip,quotas,quota_details,rbac-policies,router,router_availability_zone,security-group,port-security-groups-filtering,segment,service-type,sorting,standard-attr-description,standard-attr-revisions,standard-attr-segment,standard-attr-timestamp,standard-attr-tag,subnet_allocation,trunk,trunk-details"
+        NETWORK_API_EXTENSIONS: "address-scope,agent,allowed-address-pairs,auto-allocated-topology,availability_zone,binding,default-subnetpools,dhcp_agent_scheduler,dns-domain-ports,dns-integration,dvr,empty-string-filtering,ext-gw-mode,external-net,extra_dhcp_opt,extraroute,fip-port-details,flavors,ip-substring-filtering,l3-flavors,l3-ha,l3_agent_scheduler,logging,metering,multi-provider,net-mtu,net-mtu-writable,network-ip-availability,network_availability_zone,pagination,port-security,project-id,provider,qos,qos-fip,quotas,quota_details,rbac-policies,router,router_availability_zone,security-group,port-mac-address-regenerate,port-security-groups-filtering,segment,service-type,sorting,standard-attr-description,standard-attr-revisions,standard-attr-segment,standard-attr-timestamp,standard-attr-tag,subnet_allocation,trunk,trunk-details"
       devstack_plugins:
         neutron: git://git.openstack.org/openstack/neutron.git
         neutron-tempest-plugin: git://git.openstack.org/openstack/neutron-tempest-plugin.git

neutron_tempest_plugin/api/admin/test_ports.py

@@ -0,0 +1,60 @@
+# Copyright 2018 Red Hat, Inc.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import netaddr
+
+from tempest.common import utils
+from tempest.lib import decorators
+
+from neutron_tempest_plugin.api import base
+
+
+class PortTestCasesAdmin(base.BaseAdminNetworkTest):
+
+    @classmethod
+    def resource_setup(cls):
+        super(PortTestCasesAdmin, cls).resource_setup()
+        cls.network = cls.create_network()
+        cls.create_subnet(cls.network)
+
+    @decorators.idempotent_id('dfe8cc79-18d9-4ae8-acef-3ec6bb719bb1')
+    def test_update_mac_address(self):
+        body = self.create_port(self.network)
+        current_mac = body['mac_address']
+
+        # Verify mac_address can be successfully updated.
+        body = self.admin_client.update_port(body['id'],
+                                             mac_address='12:34:56:78:be:6d')
+        new_mac = body['port']['mac_address']
+        self.assertNotEqual(current_mac, new_mac)
+        self.assertEqual('12:34:56:78:be:6d', new_mac)
+
+        # Verify that port update without specifying mac_address does not
+        # change the mac address.
+        body = self.admin_client.update_port(body['port']['id'],
+                                             description='Port Description')
+        self.assertEqual(new_mac, body['port']['mac_address'])
+
+    @decorators.idempotent_id('dfe8cc79-18d9-4ae8-acef-3ec6bb719cc2')
+    @utils.requires_ext(extension="port-mac-address-regenerate",
+                        service="network")
+    def test_regenerate_mac_address(self):
+        body = self.create_port(self.network)
+        current_mac = body['mac_address']
+        body = self.admin_client.update_port(body['id'],
+                                             mac_address=None)
+        new_mac = body['port']['mac_address']
+        self.assertNotEqual(current_mac, new_mac)
+        self.assertTrue(netaddr.valid_mac(new_mac))