From the earlier patch on grenade, following have been updated.
1. OVSDB from base run of neutron is upgraded to the new vswitch schema
that OVN installation builds.
2. Stop, configure and restart the neutron server and it's agents after ovn
3. Since the OVN installation removes the kernel module, the datapath gets
impacted and the br-ex will have to reconfigured.
4. Add a test network instance in the create phase and verify, if it is present
in the OVN NB DB in the verify phase.