[jdk11u-dev] RFR: 8224617: (fs) java/nio/file/FileStore/Basic.java found filesystem twice

[luchenlin]

I backport this for parity with 11.0.20-oracle.

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Commit messages:
 - Backport 185be2658060b0d80b06c96f41767d4f9dd0c9bc

Changes: https://git.openjdk.org/jdk11u-dev/pull/1933/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1933&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8224617
  Stats: 93 lines in 2 files changed: 91 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1933.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1933/head:pull/1933

PR: https://git.openjdk.org/jdk11u-dev/pull/1933