8181919: Refactor test/java/io/File/GetXSpace.sh to java test

[Brian Burkhalter]

A revised version [A] is available pursuant to the changes made in the course of the review [B] of the fix for [C].

Thanks,

Brian

[A] http://cr.openjdk.java.net/~bpb/8181919/webrev.01/
[B] http://mail.openjdk.java.net/pipermail/core-libs-dev/2020-August/068094.html
[C] https://bugs.openjdk.java.net/browse/JDK-8249703

> On Aug 5, 2020, at 11:36 AM, Brian Burkhalter <brian.burkhalter at oracle.com> wrote:
> 
> To fix [1], please consider the patch [2]. This follows on from the proposed change [3] which in turn follows from [4].
> 
> Thanks,
> 
> Brian
> 
> [1] https://bugs.openjdk.java.net/browse/JDK-8181919 <https://bugs.openjdk.java.net/browse/JDK-8181919>
> [2] http://cr.openjdk.java.net/~bpb/8181919/webrev.00/ <http://cr.openjdk.java.net/~bpb/8181919/webrev.00/>
> [3] https://mail.openjdk.java.net/pipermail/core-libs-dev/2020-August/068025.html <https://mail.openjdk.java.net/pipermail/core-libs-dev/2020-August/068025.html> (GetXSpace should not run on AIX)
> [4] http://mail.openjdk.java.net/pipermail/core-libs-dev/2020-July/067990.html <http://mail.openjdk.java.net/pipermail/core-libs-dev/2020-July/067990.html> (GetXSpace fails on macOS)