build_bt5_from_cvs.sh: Don't print useless stuff so it becomes crontab-able.
  Generate bt5 list from repository in case there are any BT5 added by someting else than this script.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@5495 20353a03-c40f-0410-a6d1-a30d3c3de9de