RFR of JDK-8030950: TEST_BUG: java/rmi/registry/classPathCodebase/ClassPathCodebase.java failing intermittently

[Hamlin Li]

Would you please review the below patch?

bug: https://bugs.openjdk.java.net/browse/JDK-8030950
webrev: http://cr.openjdk.java.net/~mli/8030950/webrev.00/

Thank you
-Hamlin