Fixes #6490/BZ1116143 - remove unsed Katello javascript.

Remove the old Katello javascript that has since been replaced
by Bastion.

http://projects.theforeman.org/issues/6490
https://bugzilla.redhat.com/show_bug.cgi?id=1116143
Merge pull request #4388 from waldenraines/6490

Fixes #6490/BZ1116143 - remove unsed Katello javascript.