Add jobrunner class

'jobrunner' is the projected replacement for the current job-loop.sh shell
script. This patch configures its repository to be deployed via Trebuchet and
for a simple service to be managed by Puppet.

Change-Id: Iff2c6c27147592a9d0afc95c9770c9841814c1a1
Merge "Add jobrunner class" into production