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/AtomixAtomicValue.java b/core/store/primitives/src/main/java/org/onosproject/store/atomix/primitives/impl/AtomixAtomicValue.java
index 0843f9c..48c524a 100644
--- a/core/store/primitives/src/main/java/org/onosproject/store/atomix/primitives/impl/AtomixAtomicValue.java
+++ b/core/store/primitives/src/main/java/org/onosproject/store/atomix/primitives/impl/AtomixAtomicValue.java
@@ -81,4 +81,9 @@
         }
         return CompletableFuture.completedFuture(null);
     }
+
+    @Override
+    public CompletableFuture<Void> destroy() {
+        return adaptFuture(atomixValue.delete());
+    }
 }