[ONOS-6345] Track tombstones within transactions for optimistic locking on null values

Change-Id: Ib4764721e512462ec1552124ff696b8f89687d8f
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentMap.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentMap.java
index 8a13c01..7220c37 100644
--- a/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentMap.java
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentMap.java
@@ -298,7 +298,7 @@
 
     @Override
     public CompletableFuture<Version> begin(TransactionId transactionId) {
-        return client.submit(new TransactionBegin()).thenApply(Version::new);
+        return client.submit(new TransactionBegin(transactionId)).thenApply(Version::new);
     }
 
     @Override