FWaaS handler/callbacks for the Neutron service

Patch #3: Activator tweek

Patch #2: Rebased and applied Flavio's patch. Thanks.

Patch #1: Plumbing the Controller OS FWaaS API into
the ovsdb net-virt bundle.

Change-Id: If037b03e2d954192e9721d67f45f31eb5d9fe66e
Signed-off-by: Brent Salisbury <brent.salisbury@gmail.com>