Comment 6 for bug 1509543

Looks like this failure was caused by this patchset https://review.openstack.org/#/c/221542/

It fails due to non exist network groups on line nailgun/network/neutron.py:395

            # Default admin network has no node group
            if network == consts.NETWORKS.fuelweb_admin:
                net_db = cls.get_admin_network_group(node.id)
            else:
                net_db = objects.NetworkGroup.get_from_node_group_by_name(
                    node.group_id, network)

            # Ensure network_group configuration is consistent
            # with the template
            if vlan != net_db.vlan_start:
                net_db.vlan_start = vlan
                db().add(net_db)
                db().flush()