BigSwitch: sync state on disassociate floating ip
BigSwitch: sync state on disassociate floating ip

Sends the state of port's parent network to the backend controller
when a floating IP is disassociated from a port.

Closes-Bug: #1235074
Change-Id: I8375e6564b5d08f1adc7e7aef6affc97c8d03c5e
(cherry picked from commit 0bae949eed229613c77c4943edbf68c1c140f977)

kaiweifan/neutron,kaiweifan/neutron,rickerc/neutron_audit,rickerc/neutron_audit,rickerc/neutron_audit,kaiweifan/neutron