Fixes #6653/BZ1013689: show success message on repo creation and update.

http://projects.theforeman.org/issues/6653
https://bugzilla.redhat.com/show_bug.cgi?id=1013689
Merge pull request #4445 from waldenraines/6653

Fixes #6653/BZ1013689: show success message on repo creation and update.