@Override
    public void dispose() throws SaslException {
        password = null;
        authzid = null;
        authcid = null;
        completed = false;
    }
Disposes of any system resources or security-sensitive information
the SaslServer might be using. Invoking this method invalidates
the SaslServer instance. This method is idempotent.
@throws SaslException If a problem was encountered while disposing
the resources.
xmppserver/src/main/java/org/jivesoftware/openfire/sasl/SaslServerPlainImpl.java