Comment 6 for bug 1906311

So these patches unfortunately break DNS functionality in neutron and cause the dns-integration plugin to fail loading because it's not recognized as a supported plugin for OVN.

2021-06-23 08:56:42.180 7 INFO neutron.plugins.ml2.managers [req-8c74d86a-1f98-4ddd-b2a6-89bd6fa53e1e - - - - -] Initializing extension driver 'dns'
2021-06-23 08:56:42.180 7 INFO neutron.plugins.ml2.extensions.dns_integration [req-8c74d86a-1f98-4ddd-b2a6-89bd6fa53e1e - - - - -] DNSExtensionDriverML2 initialization complete
2021-06-23 08:56:42.208 7 INFO neutron.plugins.ml2.managers [req-8c74d86a-1f98-4ddd-b2a6-89bd6fa53e1e - - - - -] Got dns-integration extension from driver 'dns'
2021-06-23 08:56:42.237 7 INFO neutron.api.extensions [req-8c74d86a-1f98-4ddd-b2a6-89bd6fa53e1e - - - - -] Extension dns-integration not supported by any of loaded plugins
2021-06-23 08:56:42.238 7 INFO neutron.api.extensions [req-8c74d86a-1f98-4ddd-b2a6-89bd6fa53e1e - - - - -] Extension dns-domain-ports not supported by any of loaded plugins

We've managed to get it working again with the attached patches, but we're not 100% sure these are entirely correct as we're not that familiar with the neutron codebase.