Fix regression breaking Ironic boot-from-volume

After the recent openstacksdk patches, the volume code uses the SDK's
get_node instead of the local _get_node wrapper, causing the resulting
object to not have a UUID field that Nove expects.

This change proposes the minimum possible fix to unwedge the CI.

Change-Id: I8165628877f887553bf7b36da301ee062d29621c

nova/tests/unit/virt/ironic/test_driver.py

@@ -2332,7 +2332,8 @@ class IronicDriverTestCase(test.NoDBTestCase):
         props = self.driver.get_volume_connector(instance)
 
         self.assertEqual(expected_props, props)
-        self.mock_conn.get_node.assert_called_once_with(node_uuid)
+        self.mock_conn.get_node.assert_called_once_with(
+            node_uuid, fields=mock.ANY)
         self.mock_conn.volume_connectors.assert_called_once_with(
             node=node_uuid, details=True,
         )
@@ -2392,7 +2393,8 @@ class IronicDriverTestCase(test.NoDBTestCase):
         props = self.driver.get_volume_connector(instance)
 
         self.assertEqual(expected_props, props)
-        self.mock_conn.get_node.assert_called_once_with(node_uuid)
+        self.mock_conn.get_node.assert_called_once_with(
+            node_uuid, fields=mock.ANY)
         self.mock_conn.volume_connectors.assert_called_once_with(
             node=node_uuid, details=True,
         )

nova/virt/ironic/driver.py

@@ -2003,7 +2003,7 @@ class IronicDriver(virt_driver.ComputeDriver):
         :param instance: nova instance
         :return: A connector information dictionary
         """
-        node = self.ironic_connection.get_node(instance.node)
+        node = self._get_node(instance.node)
         properties = self._parse_node_properties(node)
         connectors = self.ironic_connection.volume_connectors(
             details=True,