RFR: 8291911: java/io/File/GetXSpace.java fails with "53687091200 != 161051996160" [v2]

[Brian Burkhalter]

> On Windows, suppress failure if the total space indicated by `df` is less than `FileStore::getTotalSpace` and the free space indicated by `df` equals `FileStore::getUnallocatedSpace`.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8291911: Account for quotas on Windows.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9856/files
  - new: https://git.openjdk.org/jdk/pull/9856/files/af2d6f50..991dc9a6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9856&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9856&range=00-01

  Stats: 34 lines in 1 file changed: 13 ins; 1 del; 20 mod
  Patch: https://git.openjdk.org/jdk/pull/9856.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9856/head:pull/9856

PR: https://git.openjdk.org/jdk/pull/9856