Remove syslog files when turning off logging

src/freedombone-logging

     $REMOVE_FILES_COMMAND /var/log/daemon.*
     $REMOVE_FILES_COMMAND /var/log/user.*
     $REMOVE_FILES_COMMAND /var/log/messages*
+    $REMOVE_FILES_COMMAND /var/log/syslog*
 }
 
 function turn_on_rsys_logging {