RFR of JDK-7146543: TEST_BUG: java/rmi/registry/readTest/readTest.sh failing intermittently with port in use

[Hamlin Li]

Would you please review the below patch?

bug: https://bugs.openjdk.java.net/browse/JDK-7146543
webrev: http://cr.openjdk.java.net/~mli/7146543/webrev.00/

The patch rewrite the test in java, fixes the bug.

Thank you
-Hamlin