Healthcheck failures should have descriptive error messages

[rssathe]

@kriskowal

tcurl --health -p 10.28.26.38:21305 chronotriggernotOk
rohan@hyperbahn04-sjc1:~$ tcurl -p 10.28.26.38:21305 chronotrigger foo
{ [TchannelNetworkError: tchannel socket error (ECONNREFUSED from connect): connect ECONNREFUSED]
  type: 'tchannel.network',
  message: 'tchannel socket error (ECONNREFUSED from connect): connect ECONNREFUSED',
  isErrorFrame: true,
  codeName: 'NetworkError',
  errorCode: 7,
  originalId: 2,
  name: 'TchannelNetworkError',
  fullType: 'tchannel.network' }
rohan@hyperbahn04-sjc1:~$ 

We should get something that notifies that hyperbahn can't connect to said service.

[Raynos]

cc @malandrew @ShanniLi

We should fix the health check to tell us more then just the string "notOk"