fixes #7979 - adding better error reporting for repo enable ui
fixes #7701,7702,7703 - adding selector for type of applicability view

for content hosts
Merge pull request #4753 from jlsherrill/7979

 fixes #7979 - adding better error reporting for repo enable ui
Merge pull request #4743 from jlsherrill/errata_switch

fixes #7701,7702,7703 - adding selector for type of applicability view
Refs #7423: Convert to using Bastion core to provide the Katello UI.

This commit removes the components that have been transitioned to Bastion
core and changes the engine to bastion_katello. Further, dependencies
in both the re-named engine and Katello are removed that no longer apply.