[OVN] Updates to tools/migrate_names.txt
[OVN] Updates to tools/migrate_names.txt

Updates to tools/migrate_names.txt to correctly represent
mapping between neutron and networking-ovn.

Change-Id: I76562302119c6727a78bc72c4cf5346b3b8befe6

mahak/neutron,openstack/neutron,openstack/neutron,openstack/neutron,mahak/neutron,mahak/neutron