We're not ready to move from puppet inventory to openstack inventory
just yet, so don't actually swap the dynamic inventory plugin. But, add
it to the system so that running manual tests of all of the pieces is
possible.
Add the currently administratively disabled hosts to the disabled group
so that we can verify this works.
Change-Id: I73931332b2917b71a008f9213365f7594f69c41e
7cee605a77