Lay the ground for the openstack icehouse migration.

- Add config files for icehouse (currently duplicates of havana)
- Remove some checks for openstack version.  These were there
  to distinguish between folsom and havana, and we aren't running
  folsom anymore.  No doubt some new checks like these will creep
  in shortly.

Change-Id: I6ef9bb1eed271acdeb32d3be1c7b6aa0d1423f5d