Disable diyChunking in Jenkins.
Use the publisher certificate to auth jenkins-cli.

As drg-user.
Template the drgadmin user configuration.

This'll let me template in the SSH pubkey.
We don't need the publisher public key for drguser.
YAML syntax touchup.
Avoid a collision with the jenkins role!
Oops, I missed a few notifications there.
Flush the Jenkins handlers.

Also, do an explicit Jenkins restart if the private key has changed,
before notifiers run. Otherwise the handlers fail because the private
key isn't recognized by Jenkins yet.
Merge pull request #620 from rackerlabs/jenkins-playbook

jenkins.yml repeatability