After wandering around a bit managed to figure out that it must be someplace on the Apache.org web site ... but still can't find a copy of the actual file I need ... I had hoped that it would have been create when I installed the plug-in via;
sudo apt-get install libapache2-mod-jk
on my Fiesty Ubuntu server. But sadly no, so I'm still looking for a copy of the workers.properties file.