Session: remove PySession

Change-Id: I361d4a471f26676d1788f8f0e5ee528307c37081
Reviewed-on: http://gerrit.aldebaran.lan/48023
Reviewed-by: pdaouadi <pdaouadi@aldebaran-robotics.com>
Tested-by: pdaouadi <pdaouadi@aldebaran-robotics.com>
TestModule: pass session as argument

Change-Id: I0eb30dd93fdd9f5cd7d65e50c59bdca3f43b8d8c
Reviewed-on: http://gerrit.aldebaran.lan/48024
Reviewed-by: pdaouadi <pdaouadi@aldebaran-robotics.com>
Tested-by: pdaouadi <pdaouadi@aldebaran-robotics.com>