Reduce munin-node log level to warning (#1330)

CHANGELOG.md

 CHANGELOG
 =========
 
+In Development
+--------------
+
+* Reduce munin-node.conf log_level to warning(1) as default ubuntu package uses log_level debug(4) which over time creates big log files.
+
+
 v0.26 (January 18, 2018)
 ------------------------
 

setup/munin.sh

@@ -38,8 +38,10 @@ chown munin. /var/log/munin/munin-cgi-html.log
 chown munin. /var/log/munin/munin-cgi-graph.log
 
 # ensure munin-node knows the name of this machine
+# and reduce logging level to warning
 tools/editconf.py /etc/munin/munin-node.conf -s \
-	host_name=$PRIMARY_HOSTNAME
+	host_name=$PRIMARY_HOSTNAME \
+	log_level=1
 
 # Update the activated plugins through munin's autoconfiguration.
 munin-node-configure --shell --remove-also 2>/dev/null | sh