Ceph » rgw

Post this commit, the logic to remove the persistent queue when the topic is deleted was moved to RgwPubsub:remove_topic().
However when the topic is removed via radosgw-admin command the notification manager s_manager is not initialized, hence the code is returned from here.
so to fix the either we need to directly call inner function by passing the notif_pool_ctx by type-casting the driver->`RadosStore` or move the logic of removal of queue inside the topic.cc file which is specific to rados store.