Add a script to install puppet.

Follow on changes should invoke this script from
install_jenkins slave, and launch-node.py.

Change-Id: Id48c3967efe8ce4087d18975f3526564e09daecc
Reviewed-on: https://review.openstack.org/18977
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: Monty Taylor <mordred@inaugust.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Tested-by: Jenkins