[gdb] Improve pretty printers of Future
[gdb] Improve pretty printers of Future

Change-Id: Ie0e9bfef1eece621500857f641f5b7fe83ffd5b0
Reviewed-on: http://gerrit.aldebaran.lan/44527
Reviewed-by: ncornu <13ba26b8f12d26c819f48749c65f2f7f5c1d13db@aldebaran-robotics.com>
Tested-by: ncornu <13ba26b8f12d26c819f48749c65f2f7f5c1d13db@aldebaran-robotics.com>

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