Client requests needs to handle multiple responses

[Ulexus]

Client requests which do not have complete coordinates (Dialog or App+AsteriskNode), need to wait for responses from all proxies, since they do not know which proxy (if any) a given resource is on.

To do this, we need to:

• maintain the list of proxies
  • when a client starts, it should ping for proxies
  • clients should have a maintenance thread which listens for, adds, and expires its list of proxies over time
• instead of using nc.Request for such queries, use explicit nc.Publish and nc.Subscribe operations with an accumulator
• filter responses to incomplete-coordinate requests such that failing responses are ignored

[Ulexus]

done