The test randomly failed since it was created because of low resolution of
creation_date column (in catalog table): Alarm.getLastActiveProcess failed
when the 2 last active processes were created in the same second.

This commit is a hack that relies on the fact that a new Active Process always
has an ID higher than previously created Active Processes.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@28401 20353a03-c40f-0410-a6d1-a30d3c3de9de