[jdk11u-dev] RFR: 8309778: java/nio/file/Files/CopyAndMove.java fails when using second test directory

[Andrew Lu]

I backport this for parity with 11.0.23-oracle.

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Commit messages:
 - Backport cfae6ef2f61f0a6611de2f66e6e773c547ba7878

Changes: https://git.openjdk.org/jdk11u-dev/pull/2495/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2495&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309778
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2495.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2495/head:pull/2495

PR: https://git.openjdk.org/jdk11u-dev/pull/2495