[RFE] return node_uuid for port-list and portgroup-list

We recently added two new resources, volume_connectors and volume_targets. By default, the REST API for listing these resources will return the node_uuid field. (That is, no need to explicitly specify the node_uuid field or to set detail=True in the request.)

For ports [2] and portgroups [3], the REST API to list them only returns the node_uuid field if that field is explicitly requested or if detail=True is specified in the API request. We discussed this in the ironic weekly meeting [1] and agreed that it would be good to return the node_uuid in these cases too.

I didn't look, but the changes to address this might need to be in ironic and ironicclient (OSC) code. Since we want to have feature parity between ironic & OSC in Pike, I don't think we should address this until Queens.

[1] http://eavesdrop.openstack.org/meetings/ironic/2017/ironic.2017-07-10-17.00.log.html#l-191

[2] https://developer.openstack.org/api-ref/baremetal/?expanded=list-portgroups-detail,list-ports-detail
[3] https://developer.openstack.org/api-ref/baremetal/?expanded=list-portgroups-detail