[JDK 11] RFR 8196211: Move two sun/nio/cs tests into OpenJDK

[Amy Lu]

Please review the patch to move two sun/nio/cs tests into OpenJDK.

bug: https://bugs.openjdk.java.net/browse/JDK-8196211
webrev: http://cr.openjdk.java.net/~amlu/8196211/webrev.00/

Thanks,
Amy