Add missing require_once

Change-Id: Icfe327abeb5d8ab1fd322e16f5acc7cb37e82b2f
Merge commit 'refs/changes/85/1385/1' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  Add missing require_once

Change-Id: Ida7a1df783720661a130bda41461264962e45681
Tuleap 6.6.99.20

Change-Id: Ia314f9df4bc52da46e273b13328e3b96e83864a1