request #7350 Tv3 export to Tv5: Improve logging

Introduce:
* Stacked logging ([one][two]...) so we know were we are in our logs
* Filtered logging (by level) so we don't log too much things
* Log broker so we can distribute logs on various devices

Change-Id: I645050235bfeb92a2a187fb497d9c25ca93c0a41
Merge commit 'refs/changes/04/2904/2' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  request #7350 Tv3 export to Tv5: Improve logging

Change-Id: Ib1aeaf0d0751b437bcb6f021f8e9c70137b453a6
This is Tuleap 7.3.99.67

Change-Id: Ic5555b4eee879823ad3b6a00cc9067d8a9355853