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
I think the problem is, you are only doing this for the 'initial' setup, as you are limited in this use by what the underlying Nutupane is doing -- https://github.com/Katello/bastion/blob/master/app/assets/javascripts/bastion/widgets/nutupane.factory.js#L56