Redirect stderr to stdout and by default log monetdbd output

configs/supervisord.conf

@@ -5,6 +5,8 @@ nodaemon=true
 command=monetdbd start /var/monetdb5/dbfarm
 autorestart=false
 user=monetdb
+redirect_stderr=true
+stdout_logfile=/var/log/supervisor/monetdbd.log
 priority=1
 exitcodes=0
 startsecs=0