Comment 3 for bug 1835557

I was able to reproduce this. DVR is a requirement of course as l3 agent is running on nova-compute. So e.g. something like the following is needed to recreate. I think we'll need some updates to charm-nova-compute to restart subordinate services after upgrading to rocky.

    neutron-gateway:
      charm: cs:~openstack-charmers-next/neutron-gateway
      constraints: mem=4G
      options:
        instance-mtu: 1300
    neutron-api:
      charm: cs:~openstack-charmers-next/neutron-api
      constraints: mem=1G
      options:
        neutron-security-groups: True
        enable-ml2-port-security: True
        enable-qos: True
        enable-vlan-trunking: True
        flat-network-providers: physnet1
        enable-dvr: True
        l2-population: True
    neutron-openvswitch:
      charm: cs:~openstack-charmers-next/neutron-openvswitch
      options:
        enable-local-dhcp-and-metadata: True
        bridge-mappings: physnet1:br-ex