@Override
    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        subdomain = ExternalizableUtil.getInstance().readSafeUTF(in);
    }
Task that will remove a service from the cluster node. When a service is destroyed
in a cluster node the rest of the cluster nodes will need to destroy their copy.

@author Daniel Henninger
xmppserver/src/main/java/org/jivesoftware/openfire/muc/cluster/ServiceRemovedEvent.java