Fixes #8127: add errata counts to the content host details page.

Add errata counts to the content host details page and link to
the content host's errata page.

http://projects.theforeman.org/issues/8127
Fixes #8283: Require jquery-ui-rails for the RPM spec and bump Runcible.

These changes are required to fix the current RPM build.
Merge pull request #4804 from ehelms/fixes-8283

Fixes #8283: Require jquery-ui-rails for the RPM spec.
Merge pull request #4778 from waldenraines/8127

Fixes #8127: add errata counts to the content host details page.