Status update for WG rmcat

As of IETF 103, RMCAT had completed working group last call on the evaluation and video traffic model drafts, noting only minor issues. These drafts will be updated, a brief WG last call done to confirm the changes, then sent to the IESG in the November/December 2018. The NADA draft has two implementations, that perform as expected. There were implementations of the congestion control feedback draft at the hackathon, resulting in suggestions for minor updates.