fixes #7979 - adding better error reporting for repo enable ui
Fixes #7949: show affected packages of errata on details page.

http://projects.theforeman.org/issues/7949
Merge pull request #4752 from waldenraines/7949

Fixes #7949: show affected packages of errata on details page.
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