Use upper-constraints when installing packstack from source
Use upper-constraints when installing packstack from source

Currently, it's not using the constraints file so we may use different
versions that other services.

Change-Id: I3f8eb965b6f08ddf6c0bc89a53e051e43047aecb

openstack/packstack,stackforge/packstack,fr34k8/packstack,mahak/packstack,openstack/packstack,openstack/packstack,stackforge/packstack,mahak/packstack,fr34k8/packstack,fr34k8/packstack,stackforge/packstack,mahak/packstack