Add configuration_script_sources.last_update_stdout

Add new last_update_stdout column to configuration_script_sources table.
This allows to store last update stdout to display more information
about why its refresh failed.

app/models/manager_refresh/inventory/core.rb

@@ -28,7 +28,7 @@ def has_configuration_script_sources(options = {})
         :manager_ref                 => [:manager_ref],
         :inventory_object_attributes => %i(
           name description scm_type scm_url scm_branch scm_clean scm_delete_on_update
-          scm_update_on_launch authentication status last_updated_on
+          scm_update_on_launch authentication status last_updated_on last_update_error
         ),
       }.merge(options))
     end