python: improve Session sync support
python: improve Session sync support

Change-Id: Ie6e0ca5100ac0b1c6f9c6aff45f5039156507c4f

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