JDK 10 RFR of JDK-8181395: Refactor several java/nio locale related shell tests to java

[Amy Lu]

java/nio/charset/Charset/default.sh
java/nio/charset/coders/CheckSJISMappingProp.sh
java/nio/file/Path/MacPathTest.java which runs shell test:
      * @run shell MacPathTest.sh

Please review this patch to refactor these shell tests to java.

Note that in MacPathTest.sh, it requires the test to be run with 
LC_ALL=en_US.UTF-8 env. But unlike the other two tests, LC_ALL settings 
here is just to setup an env in order for the test to work correctly, 
it’s not the locale it intends to test.

bug: https://bugs.openjdk.java.net/browse/JDK-8181395
webrev: http://cr.openjdk.java.net/~amlu/8181395/webrev.00/

Thanks,
Amy
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