Add ovn_dbs_vip to export_data
Add ovn_dbs_vip to export_data

Via I4e4bf0a91751fb4f9e4c7233242cdc5649c421f8 we are creating a separate
OVN VIP (i.e. one independent from haproxy internal_api VIP) so like
redis_vip we want to add ovn_dbs_vip to the data exported for cell
support.

Depends-On: I4e4bf0a91751fb4f9e4c7233242cdc5649c421f8

Change-Id: I40e7df90fb75916dc78934850620f46faa414e74
Related-Bug: #1841811

openstack/python-tripleoclient