Updated openstack/openstack
Project: openstack/nova  c3d4a9b45d7a0c32d36374ad63ca4469975f1895

ironic: use instance object for `_add_driver_fields`

It will be better if we'll use `instance` like object.

Change-Id: I81099563a8f76577c2b5c6901d2b0b89b86182a2