request #7449: Adding logging to debug ldap connexion issues

Change-Id: Ibcd8240564c2c77dd0f7ffc0db376c9aedbc110e
Merge commit 'refs/changes/96/2496/7' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  request #7449: Adding logging to debug ldap connexion issues

Change-Id: I684bb4ce5f50126f7eba0c7f6d0ea0c7789163b7
This is Tuleap 7.7.99.42

Change-Id: I1eaf760bdf6ed7d468666cfb7e499211926f5fcc