python: signal: use PyThreadSafeObject to store object into callbacks
python: signal: use PyThreadSafeObject to store object into callbacks

Change-Id: Ic3274a1e4308426824b905ffc09377f102035008
Reviewed-on: http://gerrit.aldebaran.lan/25020
Reviewed-by: hcuche <2a0975cc082cedff4d4350e3f6ec187146151bc6@aldebaran-robotics.com>
Tested-by: ncornu <13ba26b8f12d26c819f48749c65f2f7f5c1d13db@aldebaran-robotics.com>
Reviewed-on: http://gerrit.aldebaran.lan/25110
Reviewed-by: ncornu <13ba26b8f12d26c819f48749c65f2f7f5c1d13db@aldebaran-robotics.com>

aldebaran/libqi,vbarbaresi/libqi,aldebaran/libqi,aldebaran/libqi,bsautron/libqi