Now that Nodepool is reasonably working, it is time to push the red button. We should migrate a single job to use Nodepool instances, the first target is integration/config.git
@hashar is electing the job integration-jjb-config-diff. It is currently tied to Jenkins nodes matching the label selector contintLabsSlave && UbuntuPrecise.
Should be tied to label ci-jessie-wikimedia and have NODE_OFFLINE_WHEN_COMPLETE=1 injected by Zuul by applying the parameter function offline_when_complete().
We also need the job to emit build status over ZeroMQ for Nodepool to notice an instance is being used and have it delete it as soon as the job is complete.