get-nodes doesn't report all agents correctly after fresh multi-node cluster startup

[dopheide-esnet]

When starting up a multi-node cluster, you can have all of the agents running but 'get-nodes' will only report the local agent/controller combo on the manager. You have to deploy a config (even a blank one) before 'get-nodes' will show the other agents. That's slightly annoying when you're trying to validate that various stages of startup have worked.

[dopheide-esnet]

Well, it can't be a completely blank config, you have to at least define the [instances].