Foreman Maintain

Description of problem:

So far, the failure on the validation was mostly caused by an issue described in the article:
https://access.redhat.com/solutions/3362821

The ask of this BZ is:

1. implement the fix procedure
2. in the error message of the failure, provide a link to the KCS article for further details (using a similar approach, as we have with foreman-tasks ui investigate https://github.com/theforeman/foreman_maintain/blob/master/definitions/procedures/foreman_tasks/ui_investigate.rb might be suitable here, with having a procedure called Knowledge Base article.