Add clear_db to cleanup for TestCiscoNexusPlugin

Fixes Bug: #1234012
Change-Id: I0829f04ac1a0760d96babcb1154f4f569a0f848f
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
Merge "Add clear_db to cleanup for TestCiscoNexusPlugin"
Merge "BigSwitch: sync state on disassociate floating ip"