When a LogicalSwitchPortUpdate event is triggered after removing
FIP from LB VIP, the event received include the port affected,
but the FIP related is not passing to the handler method.
This patch includes the FIP into the info passed to the handler
method, simplifying the current handler logic and providing
future support for the new multi-vip feature. Also added a match
for only manage events including external_id updates.
Closes-Bug: #2028161
Change-Id: Ibee3906e8e9575fba7811e989e3e111a026ce45b
Fernando Royo
e9a55cd2b6