was a mistake to use cmf_activity_sql_connection.

because of the wrong connection, and because id tool is doing
commits in the middle of transactions, rollback commands from
CMFActivity were not working. This can ends with inconsistent
activities

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@35192 20353a03-c40f-0410-a6d1-a30d3c3de9de