tasks #6973: Allow outsiders to include entries in aliases file

This step is necessary to let the tracker to include forge__* user in
aliases.codendi in order to parse incoming emails (see story #6301)

Change-Id: Ie9b59d720292772f45327eb57d38dd00739d6210
Merge commit 'refs/changes/39/2539/4' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #6973: Allow outsiders to include entries in aliases file

Change-Id: Ic6478a22366c8e9087a3a3c54e6e995083302f59
This is Tuleap 7.1.99.8

Change-Id: Ic47d218e70bb4317d002ce600a4a235e9b50e7c5