Generalize the MultiValuedTimestamp.

Change-Id: I691730d59f440778856afd0e4808ba775eccba0a
diff --git a/core/store/dist/src/main/java/org/onosproject/store/intent/impl/IntentDataLogicalClockManager.java b/core/store/dist/src/main/java/org/onosproject/store/intent/impl/IntentDataLogicalClockManager.java
index 950cfde..4636cd7 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/intent/impl/IntentDataLogicalClockManager.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/intent/impl/IntentDataLogicalClockManager.java
@@ -31,6 +31,7 @@
 
     @Override
     public Timestamp getTimestamp(K key, IntentData intentData) {
-        return new MultiValuedTimestamp(intentData.version(), sequenceNumber.getAndIncrement());
+        return new MultiValuedTimestamp<>(intentData.version(),
+                                          sequenceNumber.getAndIncrement());
     }
 }