Add missing file

+package org.onlab.onos.store.service;
+
+import java.util.Arrays;
+
+/**
+ * Wrapper object that holds the object (as byte array) and its version.
+ */
+public class VersionedValue {
+
+    private final byte[] value;
+    private final long version;
+
+    /**
+     * Creates a new instance with the specified value and version.
+     * @param value
+     * @param version
+     */
+    public VersionedValue(byte[] value, long version) {
+        this.value = value;
+        this.version = version;
+    }
+
+    /**
+     * Returns the value.
+     * @return value.
+     */
+    public byte[] value() {
+        return value;
+    }
+
+    /**
+     * Returns the version.
+     * @return version.
+     */
+    public long version() {
+        return version;
+    }
+
+    @Override
+    public String toString() {
+        return "VersionedValue [value=" + Arrays.toString(value) + ", version="
+                + version + "]";
+    }
+}