login become optional

Fix #13731

Change-Id: I3fdec5c41ad2d10c2b0a5fa69cf128db325966fb
Reviewed-on: http://gerrit.aldebaran.lan:8080/17842
Tested-by: gerrit
Reviewed-by: dmerejkowsky <dmerejkowsky@aldebaran-robotics.com>
Reviewed-by: sbarthelemy <sbarthelemy@aldebaran-robotics.com>