- OVN init script must be able to attach an interface
to the provider network bridge and migrate IP from the
interface to the bridge exactly like Neutron OVS agent
init script does it.
- OVN init script sets gateway option to those OVN controller
instances which are running on nodes with l3-agent=enabled
label.
Change-Id: I24345c1f85c1e75af6e804f09d35abf530ddd6b4
fb90642b18