story #3318 - Gerrit groups are owned by project_admins

All gerrit user groups must be owned by project_admins otherwise
they are not visible nor usable by admins in Access Control.

Change-Id: I73c633fe49f2ecbca9808a1b00915c30b44c9e0b
Merge commit 'refs/changes/40/440/1' of http://gerrit.tuleap.net/tuleap into stable

* http://gerrit.tuleap.net/tuleap:
  story #3318 - Gerrit groups are owned by project_admins
This is Tuleap 6.0.99.13