server: Proper destruction.
server: Proper destruction.

Keep track of all connected clients, delete them when they disconnect.

Change-Id: I76099d435eb0efcf857ad495f77d9b9b88aacb01
Reviewed-on: http://gerrit.aldebaran.lan:8080/3675
Reviewed-by: cgestes <ddb78fe00abb42f91254c16a0860e38eb0781789@aldebaran-robotics.com>
Tested-by: cgestes <ddb78fe00abb42f91254c16a0860e38eb0781789@aldebaran-robotics.com>

bsautron/libqi,aldebaran/libqi-java,aldebaran/libqi,vbarbaresi/libqi,aldebaran/libqi-java,aldebaran/libqi-java,aldebaran/libqi,aldebaran/libqi