tasks #7378: make all fts system events be run in their own process

Change-Id: I66d5a32992b75d335960274dad53dc242db0e25e
Merge commit 'refs/changes/35/2935/10' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #7378: make all fts system events be run in their own process

Change-Id: I8b600e302df7396b1503d7283b2c80529172c610
This is Tuleap 7.4.99.8

Change-Id: I86b6ac878bd1d2c4121da106e5d0a53497b47500