SONAR Suggestion - protected members in final classes are pointless

Change-Id: Ie34d86aecf181e73867a14864d75e0db8a8f48f3
diff --git a/utils/misc/src/main/java/org/onlab/util/DefaultHashMap.java b/utils/misc/src/main/java/org/onlab/util/DefaultHashMap.java
index 6523d56..ed5cf49 100644
--- a/utils/misc/src/main/java/org/onlab/util/DefaultHashMap.java
+++ b/utils/misc/src/main/java/org/onlab/util/DefaultHashMap.java
@@ -24,7 +24,7 @@
 public final class DefaultHashMap<K, V> extends HashMap<K, V> {
 
     /** Default value to return when no key binding exists. */
-    protected final V defaultValue;
+    private final V defaultValue;
 
     /**
      * Constructs an empty map with the given default value.