[Bug] Discovery self-node has wrong annotation port number when publishing JMX URL

[andrewazores]

In Registration.java:

        URI uri = callback;
        if (preferJmx && jmxPort > 0) {
            uri =
                    URI.create(
                            String.format(
                                    "service:jmx:rmi:///jndi/rmi://%s:%d/jmxrmi",
                                    hostname, jmxPort));
        }
        DiscoveryNode.Target target =
                new DiscoveryNode.Target(
                        realm,
                        uri,
                        appName,
                        jvmId,
                        pid,
                        hostname,
                        uri.getPort(),
                        javaMain,
                        startTime);

The uri.getPort() here returns the correct expected port number when the registration connectUrl is the agent's own HTTP connection. When the registration uses JMX, however, (ie when registration.prefer-jmx config property is set), then this returns -1 instead of the actual JMX port number.