server: reduce log verbosity
server: reduce log verbosity

Change-Id: I2048e0f27a871077ed54ba6e9a1947c7f0d98844
Reviewed-on: http://gerrit.aldebaran.lan:8080/18698
Reviewed-by: mnottale <e3ccf1b6558404e921a21fa09cebb1153b50ec36@aldebaran-robotics.com>
Tested-by: cgestes <ddb78fe00abb42f91254c16a0860e38eb0781789@aldebaran-robotics.com>

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