Shutdown cleanup; hunt for exceptions continues

Change-Id: I8cbfaec0820d63f5122a82dd25ba249ba1f690a4
diff --git a/core/store/dist/src/main/java/org/onosproject/store/group/impl/DistributedGroupStore.java b/core/store/dist/src/main/java/org/onosproject/store/group/impl/DistributedGroupStore.java
index 1d30607..d6d92a9 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/group/impl/DistributedGroupStore.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/group/impl/DistributedGroupStore.java
@@ -234,6 +234,9 @@
 
     @Deactivate
     public void deactivate() {
+        groupStoreEntriesByKey.destroy();
+        groupStoreEntriesById.destroy();
+        auditPendingReqQueue.destroy();
         log.info("Stopped");
     }