The OpenStack Infra team has been running on the EOL'd puppet 3 for too long, they need help updating.

The plan is here: https://review.openstack.org/449933

Still to be done:

• Write functional tests for the hairier puppet modules, especially the ones that don't have -dev instances in http://git.openstack.org/cgit/openstack-infra/system-config/tree/manifests/site.pp
• Work with the Infra rooters to turn on the future parser for each node and eventually run the actual upgrade