A helpful error message would be really beneficial when daq_apps fail to start

[bieryAtFnal]

At the moment, when we try to run an integtest out of a base release, the daq_applications fail to start because of a problem with the RTE script.

What I'm reporting in this Issue, though, is how drunc gives that feedback to the user. What I see on the console is the following:

ApplicationLookupUnsuccessful: Could not resolve the URI for 'root-controller_control' in the connectivity service, got 
response []
Exiting...

There are many more strings printed on the console, and I can provide them, if that would be helpful.

In summary, though, "Could not resolve the URL for the root controller" does not help me understand that the daq_applications failed to start...