tasks #7470: REST /users/id/memberships

Change-Id: I65bdb0365b73ce75cabdbaf5dfb8b4db2d649323
Merge commit 'refs/changes/53/3053/4' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #7470: REST /users/id/memberships
This is Tuleap 7.5.99.17

Change-Id: I8ec5a8aaecedc1522971fd1ecd063585859aa3c3