WebUI: Add possibility to turn of autoload when details.load is called
When field on details facet has set 'autoload_value' to false, then it won't
be loaded using that.load method of details facet. That means that field
might stay unchanged even that loading of data was performed.
Part of: https://pagure.io/freeipa/issue/6601
Reviewed-By: Petr Vobornik <pvoborni@redhat.com>