fixes #17395 - use admin user for load_template_vars

When `load_template_vars` is called from before_action, the current user
must already be set to ensure caching of parameters inside Host#params
is done with consistent permissions. Otherwise when Foreman::Renderer's...

Fixes #12156 - Adds email configuration into Foreman settings

Instead using email.yaml, the email configuration
can be modified dynamically via settings.
(cherry picked from commit 5a8f4579cbf581b7c54d86f3dc055d45362e6508)

fixes #17095 - ensure subnet belongs to ip from facts

(cherry picked from commit 911c6e9ec797de05c484064ff3ffc67ba53ae53a)

Fixes #16987 - Added ability to apply facet attributes

(cherry picked from commit 86f7f4f58a08488c0ea7d3e06c71eaba2be71d57)

fixes #17157 - inconsistent mapping of host owner

There is user_group which is assigned to one host as owner
with id=x. For organization assigned to user with same id=x,
on edit page showing a grey color with message
"this is used by a host".
With this commit, it should not show message to organization...

Fixes #17535 - Associate host with multiple NICs to VMWare VM

(cherry picked from commit 239609088ef8d0310c0f865e514d048c77d7cc26)

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...

Refs #1556 - Remove puppet docroot setting from db and tests

(cherry picked from commit d7d14c75de4256317d5dad6a00f2e22bc4b905ef)

Fixes #1556, #11615 - Remove puppet rdoc support

Puppet rdoc support has been broken for a long time. Removing it from
Foreman.
(cherry picked from commit b1dad4cd18dfc69faa8f1509b0b5b9a361976d59)

Fixes #17494 - Remove stray end statement

(cherry picked from commit ee7d140fc79270de428d9bbe722360a89bf8afde)