Discussion - Reporting on which VLANs are available.

[SColson82]

It would be useful for the user to be able to determine which VLANs are available for the purpose of avoiding frustration when building an L2VPN. The intention would be that the user could query available Port IDs and then query the available VLANs at those Port IDs, or alternatively, to query all available VLANS for each Port ID. This is an API Endpoint that will be added to the SDX Controller. I am filing this issue for continued discussion and implementation once the Endpoint is in place.