python: session: adapt to new future
python: session: adapt to new future

Change-Id: I8cc5753c70e78ca80251c9739bd7b0c849c4f4ad

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