Comment 13 for bug 1857026

Deployed focal-wallaby from charm-neutron-api-plugin-ovn gate tests and patched Neutron for some unresolved issues at Wallaby. The need to do that is unfortunate but this verificat
ion is about the OVN pacakges, so let's focus on them.

With two instances running we can see the following information in the OVN DB:
$ sudo ovn-nbctl list dns
_uuid : a62d480f-e5ad-421e-9e8a-ab4072232331
external_ids : {ls_name=neutron-7d2d7f7e-ebb9-4625-a2ab-8bb6647f1988}
records : {"182.0.168.192.in-addr.arpa"=zaza-neutrontests-ins-1.openstack.example, "239.0.168.192.in-addr.arpa"=zaza-neutrontests-ins-2.openstack.example, zaza-neutrontests-ins-1="192.168.0.182", zaza-neutrontests-ins-1.openstack.example="192.168.0.182", zaza-neutrontests-ins-2="192.168.0.239", zaza-neutrontests-ins-2.openstack.example="192.168.0.239"}

Control test:
From instance forward DNS lookups of other instance names work:
$ host zaza-neutrontests-ins-1.openstack.example
zaza-neutrontests-ins-1.openstack.example has address 192.168.0.182

But reverse DNS lookup of other instance IP does not work:
$ host 192.168.0.182
Host 182.0.168.192.in-addr.arpa. not found: 3(NXDOMAIN)

Upgrade to packages from -proposed:
$ juju run --application ovn-chassis 'dpkg -l | grep ovn'
- Stdout: |
    ii neutron-ovn-metadata-agent 2:18.1.1-0ubuntu2~cloud0 all Neutron is a virtual network service for Openstack - OVN metadata agent
    ii ovn-common 20.12.0-0ubuntu3.1~cloud0 amd64 OVN common components
    ii ovn-host 20.12.0-0ubuntu3.1~cloud0 amd64 OVN host components
  UnitId: ovn-chassis/0
- Stdout: |
    ii neutron-ovn-metadata-agent 2:18.1.1-0ubuntu2~cloud0 all Neutron is a virtual network service for Openstack - OVN metadata agent
    ii ovn-common 20.12.0-0ubuntu3.1~cloud0 amd64 OVN common components
    ii ovn-host 20.12.0-0ubuntu3.1~cloud0 amd64 OVN host components
  UnitId: ovn-chassis/1

Confirm updated packages work:
$ sudo systemctl restart systemd-resolved
$ host zaza-neutrontests-ins-1.openstack.example
zaza-neutrontests-ins-1.openstack.example has address 192.168.0.182
$ host 192.168.0.182
182.0.168.192.in-addr.arpa domain name pointer zaza-neutrontests-ins-1.openstack.example.