Do not purge group store state when a node is shutdown

Change-Id: Ia33519613006d1960bd6f9d436b55426ec707c69
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 996356a..26a9fde 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
@@ -218,8 +218,6 @@
     public void deactivate() {
         cfgService.unregisterProperties(getClass(), false);
         clusterCommunicator.removeSubscriber(GroupStoreMessageSubjects.REMOTE_GROUP_OP_REQUEST);
-        groupStoreEntriesByKey.destroy();
-        auditPendingReqQueue.destroy();
         log.info("Stopped");
     }