Make sure openstack::openstack-manager creates /a

mediawiki::scap no longer does this as the deployment
dir changed to /srv.
This will (probably) change the ownership of /a from mwdeploy:mwdeploy
to root:root on virt1000.

Change-Id: Iae6dc9cfe832603f8e26662b3df5667a32d6387d
Merge "Make sure openstack::openstack-manager creates /a" into production