Re-use groups informations already fetched

Reduce call to gerrit

Change-Id: Iaf7499dcfe52ac69533c2902b45c221bc702f2cf
Merge commit 'refs/changes/25/425/2' of http://gerrit.tuleap.net/tuleap into tuleap-stable-master

* http://gerrit.tuleap.net/tuleap:
  Re-use groups informations already fetched

Change-Id: I7df2f02bd90026f951774eebebd65c4b6b299e47
Tuleap 5.12.99.73

Change-Id: I09d912d5a10f9f7b39d2c24b64581caa815406c5