session: use listener logic for proxy rules

session: use listener logic for proxy rules

This moves session proxy logic from session rules tables to table/logic
used to manage session listeners in order to avoid overlap of
semantically different rules.

Change-Id: I463522cce91b92d942f6a2086fb14c3366b9f023
Signed-off-by: Florin Coras <fcoras@cisco.com>