tasks #6976 : Unique message-id

Change-Id: I5c335524bf4f22b55c0a3906e72b81f4be2a1485
tasks #6975 : Generate meaningful salt

Change-Id: I54339da93d7130b905683d3a8995f97a4c32edc6
Merge commit 'refs/changes/53/2553/5' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #6975 : Generate meaningful salt
  tasks #6976 : Unique message-id
This is Tuleap 7.1.99.11

Change-Id: Ia24565733a4ef76916937a6016b9db8613615a0b