Comment 24 for bug 1828259

While #19 solves the problem for neutron-l3-agent we still need to poke neutron-openvswitch to run config-changed code because there may be version-specific code-paths in hooks/neutron_ovs_context.py which I am assuming will be tracked in https://bugs.launchpad.net/charm-neutron-openvswitch/+bug/1828422