[12] RFR of JDK-8209832: Refactor jdk/internal/reflect/Reflection/GetCallerClassTest.sh to plain java test

[Amy Lu]

test/jdk/jdk/internal/reflect/Reflection/GetCallerClassTest.sh

Please review this patch to refactor above shell script test to java.

bug: https://bugs.openjdk.java.net/browse/JDK-8209832
webrev: http://cr.openjdk.java.net/~amlu/8209832/webrev.00/

Thanks,
Amy