Re-add hosts table file for JobLaunchers
Created by: jayjaybillings
We need to have the ability to change the default hosts in a JobLauncher at deployment time in addition to build time and run time.
Once upon a time we had this ability, but I dumped it years back. The simplest way to do this is to provide a file that lists the extra hosts and to read that file on startup. In the past this depended on on a hardwired path in the workspace, but I will configure this so that the user can provide a path in the ICE INI file instead.