Story 4208: loginAs create user account before to inpersonate people

Change-Id: I298023f4e950b9b77977db46293457a8ef0b9942
Merge commit 'refs/changes/33/633/1' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  Story 4208: loginAs create user account before to inpersonate people

Change-Id: I97a14c1c6edbf4cd7650715e6b65df81980e4b17
This is Tuleap 6.2.99.21

Change-Id: I4ebaf554a5e6bf86e16b404bbc730ee136670408