changed models validations to 3.x format
controllers code cleanup
cleaned up /helpers folder
Moved files to folders /concerns or /services
Moved STI models to separate folders
Added extend ActiveSupport::Concerns to mixins
moved lib/foreman/controller to app/controllers/concerns
added controllers concerns to application.rb
provision SSH refactoring
added all subfolders in controllers to auto path
refactored /lib/orchestration to /services/orchestration
controller concerns refactoring