test_object: fix race
test_object: fix race

Change-Id: Ia5c9fca0586b79f5f9a0eb51fb19240544cce5cb
Reviewed-on: http://gerrit.aldebaran.lan/45504
Tested-by: gerrit
Reviewed-by: pdaouadi <fc1eb3334d3fdad315bae23aa166bc70bd434067@aldebaran-robotics.com>
Tested-by: pdaouadi <fc1eb3334d3fdad315bae23aa166bc70bd434067@aldebaran-robotics.com>

aldebaran/libqi,aldebaran/libqi,aldebaran/libqi,vbarbaresi/libqi,bsautron/libqi