Update the constraints url
Update the constraints url

For more detail, see http://lists.openstack.org/pipermail/openstack-discuss/2019-May/006478.html

Change-Id: I28b4b1e39ab291d0d1da77a96b285f89f230a8a2

openstack/puppet-ceph,openstack/puppet-ceph,stackforge/puppet-ceph