Request #6299: Add the possibility to display user unix name in access_log

Change-Id: I7007e835b1755effd0f838d2d2c8ff6301a0896b
Merge commit 'refs/changes/77/1877/5' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  Request #6299: Add the possibility to display user unix name in access_log

Change-Id: I8a3a538903e7132b82a1f1de8095b40bd806610b
Tuleap 6.10.99.37

Change-Id: I25a1645b2541c734c16e9093f55ac2f1568d5670