[jdk8u-dev] RFR: 8277159: Fix java/nio/file/FileStore/Basic.java test by ignoring /run/user/* mount points

[SendaoYan]

Hi all,

This pull request contains a backport of commit [b6876649](https://github.com/openjdk/jdk/commit/b6876649a82bed508d817ccbde1600d00937e4b2) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Alex Kasko on 17 Nov 2021 and was reviewed by Brian Burkhalter and Aleksey Shipilev.

Thanks!

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Commit messages:
 - Backport b6876649a82bed508d817ccbde1600d00937e4b2

Changes: https://git.openjdk.org/jdk8u-dev/pull/705/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=705&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8277159
  Stats: 10 lines in 1 file changed: 10 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/705.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/705/head:pull/705

PR: https://git.openjdk.org/jdk8u-dev/pull/705