The project privacy icon is now optional

- Not displayed in the service bar
- Not displayed in the MyProjects widget

Change-Id: I48f979d84fb5edbfca989683e3de90f3dd13f0e8
Merge commit 'refs/changes/51/251/3' of http://gerrit.tuleap.net/tuleap into stable

* http://gerrit.tuleap.net/tuleap:
  The project privacy icon is now optional
This is Tuleap 5.10.99.6