Fixes #5628 - remove converted v1 API controllers and tests.

Remove all of the v1 controllers and tests that have already been converted to v2 and are no longer used.

http://projects.theforeman.org/issues/5628
https://bugzilla.redhat.com/show_bug.cgi?id=1112836
I'm OK with an issue. At a minimum, we should ensure all content is retrievable by a user. I don't know that UI/CLI usage should be the decider on whether an API exists or not though, good heuristic but not the decider.