test: add test for session.loadService

Change-Id: I0832a0e2963a58b32c7e7ee59ebace39b0c4c7df
Reviewed-on: http://gerrit.aldebaran.lan/51025
Reviewed-by: pdaouadi <pdaouadi@aldebaran-robotics.com>
Tested-by: pdaouadi <pdaouadi@aldebaran-robotics.com>
module: allow createObject to return anything

Change-Id: Id688b679eae3a6262fa0fb3302bd5615277a5c6b
Reviewed-on: http://gerrit.aldebaran.lan/51104
Reviewed-by: pdaouadi <pdaouadi@aldebaran-robotics.com>
Tested-by: pdaouadi <pdaouadi@aldebaran-robotics.com>