Enable checkstyle rule for JLS modifier order

JLS specifies a preferred order for modifiers in
declarations.  Enabled this rule and fixed the
problems that it encountered.

Change-Id: I5e8fa3d29f785ced4c61fbb8c7c8b168289f06e2
diff --git a/src/main/java/net/onrc/onos/core/util/serializers/FlowEntryIdDeserializer.java b/src/main/java/net/onrc/onos/core/util/serializers/FlowEntryIdDeserializer.java
index de13574..eadb2ce 100644
--- a/src/main/java/net/onrc/onos/core/util/serializers/FlowEntryIdDeserializer.java
+++ b/src/main/java/net/onrc/onos/core/util/serializers/FlowEntryIdDeserializer.java
@@ -17,7 +17,7 @@
  */
 public class FlowEntryIdDeserializer extends JsonDeserializer<FlowEntryId> {
 
-    protected final static Logger log = LoggerFactory.getLogger(FlowEntryIdDeserializer.class);
+    private static final Logger log = LoggerFactory.getLogger(FlowEntryIdDeserializer.class);
 
     @Override
     public FlowEntryId deserialize(JsonParser jp,