Merge branch 'rs-boards-issues-create-service-parity' into 'master'

Bring CE-EE parity to app/services/boards/issues/create_service.rb

See merge request gitlab-org/gitlab-ce!19093

app/services/boards/issues/create_service.rb

@@ -10,11 +10,15 @@ module Boards
       end
 
       def execute
-        create_issue(params.merge(label_ids: [list.label_id]))
+        create_issue(params.merge(issue_params))
       end
 
       private
 
+      def issue_params
+        { label_ids: [list.label_id] }
+      end
+
       def board
         @board ||= parent.boards.find(params.delete(:board_id))
       end