Print the sha1/md5sum of generated tarballs.

Change-Id: Id536d8e1e40c8dd7c45749e0316632bce23795a8
Reviewed-on: https://review.openstack.org/19423
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins