fix clock test
fix clock test

Change-Id: Ie539652ddf7bd130880a4f3403de5633c372379b
Reviewed-on: http://gerrit.aldebaran.lan/43744
Reviewed-by: pdaouadi <fc1eb3334d3fdad315bae23aa166bc70bd434067@aldebaran-robotics.com>
Tested-by: pdaouadi <fc1eb3334d3fdad315bae23aa166bc70bd434067@aldebaran-robotics.com>

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