add equals, hashCode to VersionedValue

Change-Id: I41b981bb26fe252bfde8bc0b25e7454d5bfbe188
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/VersionedValue.java b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/VersionedValue.java
index c18b4da..a0f485a 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/VersionedValue.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/VersionedValue.java
@@ -1,5 +1,7 @@
 package org.onlab.onos.store.device.impl;
 
+import java.util.Objects;
+
 import org.onlab.onos.store.Timestamp;
 
 /**
@@ -44,6 +46,29 @@
     }
 
 
+    @Override
+    public int hashCode() {
+        return Objects.hash(entity, timestamp, isUp);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        @SuppressWarnings("unchecked")
+        VersionedValue<T> that = (VersionedValue<T>) obj;
+        return Objects.equals(this.entity, that.entity) &&
+                Objects.equals(this.timestamp, that.timestamp) &&
+                Objects.equals(this.isUp, that.isUp);
+    }
+
     // Default constructor for serializer
     protected VersionedValue() {
         this.entity = null;