Update vnctl

Vnctl was terribly out of sync with the webapi. I brought it up to date. This was built on top of https://github.com/axsh/openvnet/pull/211.

The only thing that is still not included in vnctl is the static address relation for translations. I was running out of time and that one couldn't use the defined abstraction in vnctl because it's the only place in the API where a relation DELETE request takes parameters other than uuid. Anybody with time on their hands, feel free to add that.