RFR of JDK-8170644: java/rmi/registry/interfaceHash/InterfaceHash.java failed intermittently with "Port already in use"

[Hamlin Li]

Would you please review the below patch?

bug: https://bugs.openjdk.java.net/browse/JDK-8170644
webrev: http://cr.openjdk.java.net/~mli/8170644/webrev.00/

Thank you
-Hamlin