Deprecate KryoSerializer.

Change-Id: I2403b95c2d7a8af69dff55a0e40a35b223127c85
diff --git a/core/store/serializers/src/main/java/org/onosproject/store/serializers/KryoSerializer.java b/core/store/serializers/src/main/java/org/onosproject/store/serializers/KryoSerializer.java
index e621f97..0837a91 100644
--- a/core/store/serializers/src/main/java/org/onosproject/store/serializers/KryoSerializer.java
+++ b/core/store/serializers/src/main/java/org/onosproject/store/serializers/KryoSerializer.java
@@ -25,7 +25,10 @@
 
 /**
  * StoreSerializer implementation using Kryo.
+ *
+ * @deprecated in Goldeneye (1.6.0)
  */
+@Deprecated
 public class KryoSerializer implements StoreSerializer {
 
     protected KryoNamespace serializerPool;