Add JSON output into qicli trace with --json option

Change-Id: I49e315cbb3f30fad00ab5e902b18d054458c9131
Reviewed-on: http://gerrit.aldebaran.lan/50133
Reviewed-by: pdaouadi <pdaouadi@aldebaran-robotics.com>
Approved: hcuche <hcuche@aldebaran-robotics.com>
Reviewed-by: hcuche <hcuche@aldebaran-robotics.com>
Tested-by: hcuche <hcuche@aldebaran-robotics.com>