Forbid anonymous user to add and/or update artifacts

Change-Id: Ic8d4d84c5d7db3412ea8935bf6c45ba614e24825
Merge commit 'refs/changes/89/889/5' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  Forbid anonymous user to add and/or update artifacts

Change-Id: I1859e341f146b5065a42b6bee5f7c40c2b5a2129
This is Tuleap 6.4.99.14

Change-Id: I41d0fc95bb45d3277a60f6f5cb9b44b4fb9d580d