Fixes #18718 - Empty boolean matcher should not turn into false

Fixes #18317 - Clone user role via API

Fixes #16982 - Scope properly when no taxonomies are set

The default scope for hosts and other objects did not restrict
properly by taxonomies. An user without organizations or
locations, could do anything it's permissions allow to.
The list of hosts was unrestricted and showed hosts in...

Fixes #12294 - Update existing params using API

Fixes #7495 - Create/delete autosign entries via API

fixes #13618 - cache expensive vmware api calls

Fixes #12599 - Add config groups related apipie doc

Fixes #17526 - Taxonomy.ignore? does not work with "any context"

In this scenario:

1. User has one organization - "E-Corp" - this organization allows the
user to see every hostgroup (via selecting "all host groups" when
editing the organization).

2. User has a location "Czech republic" that also includes all host...

Refs #15779 - make background processing unavailable for now (#4217)

The original PR got vetted in the packaging phase and including
foreman-task as dependency of Foreman was refused. We need to rethink
our approach for getting the foreman-tasks functionality available...

Refs #17653 - fix typo in show_hidden_parameters and add tests