Fixes #7942: redirect to correct place after creating a sync plan.

After creating a new sync plan the controller was attempting to
transition back to the previous state instead of going to a known
state.  This commit fixes the behavior.

http://projects.theforeman.org/issues/7942
Fixes #7685: add errata details page.

Add an errata details page that contains the same information as is
available on the RH customer portal.

http://projects.theforeman.org/issues/7685
Merge pull request #4739 from waldenraines/errata-details

Fixes #7685: add errata details page.
Merge pull request #4746 from waldenraines/7942

Fixes #7942: redirect to correct place after creating a sync plan.
Fixes #7961: Able to view the Errata in an Environment