Fixes #6006 - Add options to disable updates from facts

Add option ignore_facts_for_operatingsystem:
    do not update system's operating system based on facts
  Add option ignore_facts_for_domain:
    do not update system's domain based on facts

fixes #16459 - remove 1.15 deprecations

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 #17042 - add logging of task statuses after orchestration

Fixes #17592 - dont truncate on audit details page

Fixes #17597 - Prevent error on saving empty dashboard

Fixes #17503 - Only trigger PXELoader suggestion when needed

Previously every host instantiation triggered a PXELoader suggestion,
which led to up to 3 extra queries per host loaded. This changes so that
the suggestion is only applied when a host changes it's OS.

fixes #3158 - Remove rescues from try calls in helper file

In app/helpers/compute_resources_vms_helper.rb, we added rescues to
try calls as the method may not exist with older version of rails.
Now, we have updated rails to 4.x.
In this commit removed rescue block as Rails 4.0's try method...

Fixes #17548 - Orphaned smart class parameters are hidden

templates - sync from community-templates