fixes #20653 - ui notifications for hosts with usergroup owner

Fixes #19047 - unify date formats

This introduces two new helpers for printing date in absolute and
relative format. Helper for absolute accepts also a parameter to choose
between long and short variant. The long one includes the year. The date
also has a title so you see the other format after hovering mouse...

Refs #16740 - migration templates to use param macros

Fixes #20913 - add missing role_ids to user API

Refs #19050 - Update Rails 5.0 to 5.0.6

Fixes #20098 - Resolve template_used for image provisioning

At the moment, the method Hostext::OperatingSystem#template_kinds is
unable to handle image-based provisioning. If there is an image, it will
not be able to find it as 'self.compute_attributes' does not exist for...

Fixes #20897 - change description for 'default' to help tooltip

Fixes #20750 - Comment field in host page

Fixes #20454 - change page by typing page number

Fixes #20800 - Comply with Patternfly login page recommendations

• Move alerts inline above form
• Make submit button not show a "loading" state