story #7542 define a mail domain

Use forge__artifacti@mail.domain email address in from and reply-to for artifact notifications
For now, date reminders still used the noreply email address

Change-Id: I546be4fd1c89afb7fd294335e691d7543611c401
Merge commit 'refs/changes/66/3166/3' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  story #7542 define a mail domain
This is Tuleap 7.6.99.23

Change-Id: Idc60762d24b8da05dbd1403e1c7d1010b6f2ef47