RFR 9: 8158963 : RMI server-side multiplex protocol should be disabled

[Roger Riggs]

The client side support for the RMI multiplex protocol was removed in 
1999, JDK 1.2.2  [1]
and is unused.

Please review a change to disable the server side RMI multiplex protocol 
by default
and provide a property to re-enable it if necessary.
Webrev:
http://cr.openjdk.java.net/~rriggs/webrev-disable-multiplex-8158963/
Issue:
  https://bugs.openjdk.java.net/browse/JDK-8158963

Thanks, Roger

[1]  https://bugs.openjdk.java.net/browse/JDK-4183204:  client-side 
multiplexing should be disabled