Refs #17653 - add show_hidden to apidoc

fixes #18157 - use AS::Duration division to get days from expiry

ActiveSupport::Duration#parts was an unreliable API as it contains data
used internally when constructing durations.

fixes #18010 - UI Notifications front-end implementation

fixes #17545 - adds UI notification support

- Initial data model for notification support, based on manageiq design.
- addes notification JSON endpoints.

Fixes #18127 - Correcting length of group base field

Fixes #18045 - Puppet classes show up choosing only env.

After #3551 was merged, the hosts controller requires both environment
and hostgroup to be set in order to display puppetclasses.

It shouldn't be required to have both, so we should check what's
available and use it. If it's only the hostgroup or the environment, it...

Fixes #17844 - unify test mail js code

Fixes #18099 - Update the close button style

Change the close button style in the modal window, keep consistent
with PatternFly close button.

Fixes #6502 - List ignored classes and environments on import

When importing environments and classes from puppet, ignored
environments and classes defined in ignored_environments.yml
aren't aparent.

This will add them to the list to import as ignored and...

Fixes #10539 - Add default names for ifaces for oVirt CR VMs