Better Error Messages in the case of Network Issues

[randallwhitman]

It is a common occurence that users encounter issues with network configuration - such as etc/hosts or firewall - when trying to use the Geoprocessing Tools for Hadoop. An obscure error message such as getaddrinfo failed leads to the first impression that there are software bugs in the GP Tools. We should present more informative and helpful error messages, that instruct the user to investigate network configuration, rather than giving up or filing a bug report before checking the network. Cross-reference the multiple GIS-Tools-for-Hadoop issues that arose out of network issues:
Esri/gis-tools-for-hadoop#22
Esri/gis-tools-for-hadoop#16
Esri/gis-tools-for-hadoop#14