PICKED FROM TRUNK 21143

SCHEDULING-1373 : The role field in Persistent Map must also be reset when resetting hibernate ID : no more table colision when sotring in DB. WARN : ExecContainer is still deepcopied while it seems not requiered

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/proactive/scheduling/branches/Scheduling_3.1.x@21145 28e8926c-6b08-0410-baaa-805c5e19b8d6