Engine: disabling authorization (User.allowed_to)

This commit is to temporarily disable User.allowed_to? checks
and behave as all actions are allowed.
Engine: additional Katello scoping

These scopings were needed as part of 'loading' the Providers page;
however, they would apply for multiple pages.
Engine: moving the katello layouts

This commit is to move main layouts to app/views/layouts/katello
vs app/views/katello/layouts, since this is where RAILS appears
to expect them.
Engine: disabling few elements (e.g. helptips, local, current_org..etc)

This commit is temporarily disabling a few capabilities that initially
conflict with supporting katello as an engine.