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)
Set correct plugin support in Embrane based plugins

Change-Id: I87480415f55894e17458a85ef7918babaceb5e47
Closes-Bug: 1236627
(cherry picked from commit 15103e58443af95451a9ba22bc4a9083950d386e)
Merge "Set correct plugin support in Embrane based plugins" into milestone-proposed
Merge "BigSwitch: sync state on disassociate floating ip" into milestone-proposed