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
`As an API user, I should be able to list package categories for a repository."