docs: def register(self, resource, event, trigger, **kwargs):
          """Called in trunk plugin's AFTER_INIT"""
          super(AristaTrunkDriver, self).register(resource, event,
                                                  trigger, kwargs)
          registry.subscribe(self.subport_create,
                             resources.SUBPORTS, events.AFTER_CREATE)
          registry.subscribe(self.subport_delete,
                             resources.SUBPORTS, events.AFTER_DELETE)
          registry.subscribe(self.trunk_create,
                             resources.TRUNK, events.AFTER_CREATE)
          registry.subscribe(self.trunk_update,
                             resources.TRUNK, events.AFTER_UPDATE)
          registry.subscribe(self.trunk_delete,
                             resources.TRUNK, events.AFTER_DELETE)
          self.core_plugin = directory.get_plugin()
          LOG.debug("Arista trunk driver initialized.")