Fix request #6353 - 201312250950_add_reminder_roles_table doesn't work on php5.1

Change-Id: I4bb9280a6ca17b232504d31c9c1b916f9b413622
Merge commit 'refs/changes/27/2027/1' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix request #6353 - 201312250950_add_reminder_roles_table doesn't work on php5.1

Change-Id: Ie3eda0d45435905b595be4d1f5c349d691802582
Tuleap 6.10.99.70

Change-Id: I0cbc715eba733eb5974d8507efa3eecb63d95985