RFR: 8289584: (fs) Print size values in java/nio/file/FileStore/Basic.java when they differ by > 1GiB

[Brian Burkhalter]

The test fails when an expected size is greater than 1 GiB but there is no indication of how much the size deviates from the expected value. This information might be helpful in adjusting the threshold.

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Commit messages:
 - 8289584: (fs) Print size values in java/nio/file/FileStore/Basic.java when they differ by > 1GiB

Changes: https://git.openjdk.org/jdk/pull/9347/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9347&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289584
  Stats: 8 lines in 1 file changed: 3 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/9347.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9347/head:pull/9347

PR: https://git.openjdk.org/jdk/pull/9347