Add "problem" cluster manager / service discovery status to Broccoli

[FRosner]

Problem

Right now we only cover the following three cases with what could go wrong when interacting with Nomad and Consul:

1. No information available (no request has been made or Broccoli itself is not reachable)
2. Everything runs normal
3. Service (Nomad / Consul) is not reachable

But we had the case that the version was incompatible or we could not parse some output from Nomad. If this is the case (only for requests that get initiated from Broccoli, not from the user like starting a job), then we should display that there are problems with the service. The name and icon should reflect this and there should be details either in the log or in the UI as well.