Fixes #13775 - merge if data set is present

(cherry picked from commit 8e81effcedafc539cbe3477b5565d9239f1f2f51)

Fixes #17894 - load needed dependent api param group

when rendering facet api param docs
(cherry picked from commit 61ccbc34b4a69682b56ac67dbf0aedc5b71cc27f)

Fixes #17487 - support sessions for api calls

- authenticated api calls save user to session and set
flag api_authenticated_session
- sessions with such flag allow posting requests without CSRF token
- api sessions exipre the same way as UI sessions
- api sessions don't store any additional data to keep the requests...

Fixes #16422 - Foreman API throws ruby exception with ovirt network API

Passing a 'nil' resource_class to the `scope_for` method will always result in a 500 as you cannot call `.where` on nil.
(cherry picked from commit 9fb9397a7c8cbd96151cec54f2c4718f1a56ee96)

Fixes #16739 - unify parameters permissions

Fixes #17403 - enable exporting of templates

Fixes #17200 - Add option datacenter to compute resource

Fixes #16646 - Add ability to plugins to modify index scope

Fixes #16962 - Typo on domains welcome page

Fixes #6492 - ipmi_boot permission renamed to ipmi_boot_hosts

Authorizer expects permission names to follow a convention
'action'_'controller'. However this permission was not following it, and
this prevented the permission from being applied properly.

Before this fix, only admins could call ipmi_boot. I've also added a...