Fix test_datastream.cpp
Fix test_datastream.cpp

Change-Id: I2a3ff3e23cf4746bb9cd59854c0d54ced9612968
Reviewed-on: http://gerrit.aldebaran.lan:8080/5150
Reviewed-by: llec <42f1a1c02cacc0f5b0188f0127ea77bedfdcf21a@aldebaran-robotics.com>
Tested-by: llec <42f1a1c02cacc0f5b0188f0127ea77bedfdcf21a@aldebaran-robotics.com>

bsautron/libqi,aldebaran/libqi-java,aldebaran/libqi-java,aldebaran/libqi,aldebaran/libqi-java,aldebaran/libqi,vbarbaresi/libqi,aldebaran/libqi