Comment 6 for bug 1460222

I'm -1 on this as proposed. I think the idea of labels (or as Nova calls it, tags), that is *purely* used by API users only is fine to me. It seems useful as a mechanism to do filtering. I am *not* in favor of this being used in any way by a Neutron backend. I think any more additions of backend specific pass-through to the Neutron API makes Neutron less valuable as an abstraction. It's very harmful for interop because the API is effectively different depending on the backend used. I realize there is some of this in the API already, but I don't think any more should be added to make that worse.