[15] RFR: 8241311: Move some charset mapping tests from closed to open

[naoto . sato]

Hello,

Please review the fix to the following issue:
https://bugs.openjdk.java.net/browse/JDK-8241311

The proposed changeset is located at:

https://cr.openjdk.java.net/~naoto/8241311/webrev.04/

This is simply to move some test cases that have been in closed 
repository into open repository.

Naoto