(10) RFR of JDK-8181478,Refactor java/io shell tests to plain java tests

[Hamlin Li]

Would you please review the below patch?

bug: https://bugs.openjdk.java.net/browse/JDK-8181478

webrev: http://cr.openjdk.java.net/~mli/8181478/webrev.00/


Thank you

-Hamlin