story #7531 clean the debug log

Change-Id: I9917b93e9a20fd77ba067a08a66875073d40b0f9
Merge commit 'refs/changes/34/3134/2' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  story #7531 clean the debug log

Change-Id: I9834905fa1be46682ebb52484d7d8321497c10c9