Adopt Port OVO for tests/unit/db/test_provisioning_blocks.py

By adopting the Port OVO, this is a partial conversion of
tests/unit/db/test_provisioning_blocks.py to OVO.

Partially-Implements: blueprint adopt-oslo-versioned-objects-for-db
Change-Id: I6a745d7d48a828c2045142cced155658f9720ff3

neutron/tests/unit/db/test_provisioning_blocks.py

@@ -13,15 +13,16 @@
 #    under the License.
 
 import mock
+import netaddr
 from neutron_lib.callbacks import registry
 from neutron_lib.callbacks import resources
 from neutron_lib import context as n_ctx
 import testtools
 
-from neutron.db import api as db_api
 from neutron.db import models_v2
 from neutron.db import provisioning_blocks as pb
 from neutron.objects import network as net_obj
+from neutron.objects import ports as port_obj
 from neutron.tests.unit import testlib_api
 
 CORE_PLUGIN = 'neutron.db.db_base_plugin_v2.NeutronDbPluginV2'
@@ -47,12 +48,11 @@ class TestStatusBarriers(testlib_api.SqlTestCase):
 
     def _make_port(self):
         net = self._make_net()
-        with db_api.context_manager.writer.using(self.ctx):
-            port = models_v2.Port(network_id=net.id, mac_address='1',
-                                  tenant_id='1', admin_state_up=True,
-                                  status='DOWN', device_id='2',
-                                  device_owner='3')
-            self.ctx.session.add(port)
+        mac_address = netaddr.EUI('1')
+        port = port_obj.Port(self.ctx, network_id=net.id, device_owner='3',
+            project_id='1', admin_state_up=True, status='DOWN', device_id='2',
+            mac_address=mac_address)
+        port.create()
         return port
 
     def test_no_callback_on_missing_object(self):