Fixes #18582 - add missing id params to taxonomy apidoc

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 #18568 - replace deprecated AC::Parameters#update

The #update method in Rails 5 is returning a HWIA rather than the
ActionController::Parameters instance, causing keep_param to return the
wrong object type. It is also deprecated in 5.0, so replace it with a...

fixes #13618 - cache expensive vmware api calls

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...

Fixes #17681 - Switch to newly created taxonomy

Refs #17653 - fix typo in show_hidden_parameters and add tests

Refs #17653 - add show_hidden to apidoc

fixes #17545 - adds UI notification support

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