[jdk11u-dev] RFR: 8277159: Fix java/nio/file/FileStore/Basic.java test by ignoring /run/user/* mount points

[Goetz Lindenmaier]

I backport this for parity with 11.0.17-oracle.

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Commit messages:
 - Backport b6876649a82bed508d817ccbde1600d00937e4b2

Changes: https://git.openjdk.org/jdk11u-dev/pull/1414/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1414&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/jdk11u-dev/pull/1414.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1414/head:pull/1414

PR: https://git.openjdk.org/jdk11u-dev/pull/1414