jmx-dev RFR: 8010285 Enforce the requirement of Management Interfaces being public

[shanliang]

Hi,

The fix is to address https://jbs.oracle.com/bugs/browse/JDK-8016221

Webrev: http://cr.openjdk.java.net/~sjiang/JDK-8016221/webrev.00/

Instead to use a fixed port to run a JMX connector, we specify the port 
as 0:
    JMXServiceURL url = new JMXServiceURL("rmi", null, 0);
to allow JMX to select a free port.

and the fix makes sure to close the client and server when the test is 
finished (passed or failed).

Shanliang