Adding packstack

Change-Id: I815a53f62dc35aa93a147928fbfa39ae95952a61
Reviewed-on: https://review.openstack.org/19488
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: Monty Taylor <mordred@inaugust.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Tested-by: Jenkins