use the logger module in the graphite backend

backends/graphite.js

@@ -13,7 +13,10 @@
  */
 
 var net = require('net'),
-   util = require('util');
+    logger = require('../lib/logger');
+
+// this will be instantiated to the logger
+var l;
 
 var debug;
 var flushInterval;
@@ -46,7 +49,7 @@ var post_stats = function graphite_post_stats(statString) {
       var graphite = net.createConnection(graphitePort, graphiteHost);
       graphite.addListener('error', function(connectionException){
         if (debug) {
-          util.log(connectionException);
+          l.log(connectionException);
         }
       });
       graphite.on('connect', function() {
@@ -60,7 +63,7 @@ var post_stats = function graphite_post_stats(statString) {
       });
     } catch(e){
       if (debug) {
-        util.log(e);
+        l.log(e);
       }
       graphiteStats.last_exception = Math.round(new Date().getTime() / 1000);
     }
@@ -148,6 +151,7 @@ var backend_status = function graphite_status(writeCb) {
 };
 
 exports.init = function graphite_init(startup_time, config, events) {
+  l = new logger.Logger(config.log || {});
   debug = config.debug;
   graphiteHost = config.graphiteHost;
   graphitePort = config.graphitePort;