foreman: adapt to new ansible changes

Ansible 1.6.7 introduced a new change that stops passing duplicate
parameters to a module. Hence something like

debug: var=foo
       var=bar
       var=baz

does not work anymore. Replaces the above to a with_items loop.

Change-Id: I32f98e0d78259f027189cfed6fd347e8673f8a02