Improving modeling of flow_tables

This is work done by Curt Beckmann to improve/enhance the modeling of
flow_tables for the TTP.

Change-Id: I5d2d4a98a5078a2fcb619a6bb1f2d51877bfb9a4
Signed-off-by: Colin Dixon <colin@colindixon.com>
Merge "Improving modeling of flow_tables"