Hmmm,
I would remove all three, TooManyResponses is thrown in HkpKeyServer if too many possible keys are returned so also not really an error.
QueryException is thrown if a keyserver was not reachable or actually some error occured :/ The code in HkpKeyServer could be improved at this.
1) I propose removing the Log.e statements here and in the other Loader for InsufficientQuery and TooManyResponses
2) Introducing a new Exception ``ServerUnreachable`` without an error log which is also propagated into the view to show an AppMsg.
3) Don't know if you want to do it: We should then improve HkpKeyServer to only throw a QueryException if something really goes wrong and else use the new ServerUnreachable

What do you think?