public void sendAuthorizationRequest() {
        for (final JID owner : node.getOwners()) {
            sendAuthorizationRequest(owner);
        }
    }
Sends an request to authorize the pending subscription to all owners. The first
answer sent by a owner will be processed. Rest of the answers will be discarded.
xmppserver/src/main/java/org/jivesoftware/openfire/pubsub/NodeSubscription.java