<oo-install> fix reference to delete_district!

- fix broken reference to delete_district! in assistant to
  remove_district!
Merge pull request #488 from detiber/bz1162028

<oo-install> fix reference to delete_district!
<oo-install> make ose-2.2 the default ose installer
Merge pull request #489 from detiber/master

<oo-install> make ose-2.2 the default ose installer
<oo-install> use latest puppet module
Merge pull request #490 from detiber/master

<oo-install> use latest puppet module