I wonder if it would be a good idea to include a sample local.conf for devstack as well?
```
[[post-config|$NOVA_CONF]]
[DEFAULT]
notification_driver=nova.openstack.common.notifier.rpc_notifier
notification_topics=notifications,monitor_nova
notify_on_state_change=vm_and_task_state
notify_on_any_change=True
instance_usage_audit=True
instance_usage_audit_period=hour
```