Fixes #6553/BZ111225: add "repositories" to product resource type name.

There was some confusion about Repository permissions being underneath
Products. This commit simply updates the resource type name to make
it obvious that repositories are also affected by these permissions.

http://projects.theforeman.org/issues/6553
https://bugzilla.redhat.com/show_bug.cgi?id=1112255
Fixes #5502: Removes old Katello authorization system.

After migrating completely to the Foreman authorization system,
the Katello database tables, UI and other artifacts are no longer
needed.
Merge pull request #4329 from ehelms/fixes-5502

Fixes #5502: Removes old Katello authorization system.
Merge pull request #4411 from waldenraines/6553

Fixes #6553/BZ111225: add "repositories" to product resource type name.
fixes #6488 enable autosearch completion on Katello model filters