Fix handling of Future<void> again
Fix handling of Future<void> again

Previous patch seemed to work, but this is safer.
Comparison of TypeInterface by address does not always work. Compare by value
or by kind.

Change-Id: I2ab7ebf8508d71055bc61ec5ec0db60f93babd06
Reviewed-on: http://gerrit.aldebaran.lan/35150
Reviewed-by: pdaouadi <fc1eb3334d3fdad315bae23aa166bc70bd434067@aldebaran-robotics.com>
Tested-by: pdaouadi <fc1eb3334d3fdad315bae23aa166bc70bd434067@aldebaran-robotics.com>

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