python: session: add services()
python: session: add services()

Change-Id: Iac9736af4c44eb18fc3cf639061638b86f7daec5

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