vpn-statistic: move collectd.vpn to /var/ipfire/ovpn/

collectd.vpn needs to be within /var/ipfire/ovpn so that the
ovpnmain.cgi is able to write the status files from the n2n connections
to the file.

config/rootfiles/core/89/update.sh

@@ -45,6 +45,9 @@ cat <<EOF >> /etc/sysconfig/createfiles
 /var/run/openvpn        dir     644     nobody  nobody
 EOF
 
+# Update /etc/collectd.conf
+echo "include \"/etc/collectd.vpn\"" >> /etc/collectd.conf
+
 # Generate ddns configuration file
 sudo -u nobody /srv/web/ipfire/cgi-bin/ddns.cgi