Fix Sonar critical flagged bugs

Change-Id: I60e9f72a1a66f65366d7dbc5335922e75097c9f3
diff --git a/drivers/src/main/java/org/onosproject/driver/netconf/XmlConfigParser.java b/drivers/src/main/java/org/onosproject/driver/netconf/XmlConfigParser.java
index 55826a2..5443097 100644
--- a/drivers/src/main/java/org/onosproject/driver/netconf/XmlConfigParser.java
+++ b/drivers/src/main/java/org/onosproject/driver/netconf/XmlConfigParser.java
@@ -111,7 +111,7 @@
         try {
             editcfg.save(stringWriter);
         } catch (ConfigurationException e) {
-            e.printStackTrace();
+            log.error("createControllersConfig()", e);
         }
         String s = stringWriter.toString()
                 .replaceAll("<controller>",