Implement destroy() method for certain primitives to preserve backwards compatibility

Change-Id: I64e5790d531bf538bbfd886419362b14967331e6
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/atomix/primitives/impl/AtomixWorkQueue.java b/core/store/primitives/src/main/java/org/onosproject/store/atomix/primitives/impl/AtomixWorkQueue.java
index 9125b4d..89ffd4c 100644
--- a/core/store/primitives/src/main/java/org/onosproject/store/atomix/primitives/impl/AtomixWorkQueue.java
+++ b/core/store/primitives/src/main/java/org/onosproject/store/atomix/primitives/impl/AtomixWorkQueue.java
@@ -80,4 +80,9 @@
                 .withTotalPending(stats.totalPending())
                 .build());
     }
+
+    @Override
+    public CompletableFuture<Void> destroy() {
+        return adaptFuture(atomixWorkQueue.delete());
+    }
 }