private JsonNode readJsonNode(URL url)
      throws IOException, AuthenticationException {
    return _objectMapper.readTree(url.openStream());
  }
Connect to url using token and return the JsonNode

@param url The url to connect to
@return
@throws IOException Unable to get the stream
@throws AuthenticationException Authencation problem
app/com/linkedin/drelephant/analysis/AnalyticJobGeneratorHadoop2.java