Add floating ip status to table

There is missing ability to see Floating IP status in Horizon
The ability exist in CLI and was enhanced by
https://blueprints.launchpad.net/neutron/+spec/fip-op-status
This patch add the missing attribute to the floating ip table.

Change-Id: Ic64624422a6e1dce828b329eac9938bafabb84bf
Closes-bug: #1323604