Fix art #3535 - Apache authentication fails with Active Directory

It affects subversion users that rely on LDAP to do authentication.

Change-Id: Idd18efba44995c0f53ed0899b6a6d7649af27c0c
Merge commit 'refs/changes/42/442/1' of http://gerrit.tuleap.net/tuleap into stable

* http://gerrit.tuleap.net/tuleap:
  Fix art #3535 - Apache authentication fails with Active Directory
This is Tuleap 6.0.99.16