@Override
    public void writeExternal(ObjectOutput out) throws IOException {
        ExternalizableUtil.getInstance().writeSafeUTF(out, subdomain);
    }
Task that will update a service configuring in the cluster node. When a service is update
in a cluster node the rest of the cluster nodes will need to reread their configuration
from the database.

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