apply patch for optimize update from ddurieux


git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@20137 35612d4c-9d10-0410-837c-bf9dd1be60d7
add message for migration


git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@20138 35612d4c-9d10-0410-837c-bf9dd1be60d7