Add model name for Playbooks to MODEL_STRING
Add model name for Playbooks to MODEL_STRING

# Conflicts:
#	app/controllers/service_controller.rb
#	app/views/service/_svcs_show.html.haml

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic