Touch site.pp after git updates.

* modules/openstack_project/manifests/puppetmaster.pp: Ryan_Lane
indicates the puppet master maintains a cache which can be invalidated
by touching the site.pp file. Do so in order to have puppet runs after a
puppet update use the new content rather than the old.

Change-Id: I5422e7eecfd1d82a6a4416951dda6afbc855de3e
Merge "Touch site.pp after git updates."