hg: jdk/jdk14: 8225471: Test utility jdk.test.lib.util.FileUtils.areAllMountPointsAccessible needs to tolerate duplicates

[brian.burkhalter at oracle.com]

Changeset: 57f9707d8f18
Author:    bpb
Date:      2020-01-23 10:19 -0800
URL:       https://hg.openjdk.java.net/jdk/jdk14/rev/57f9707d8f18

8225471: Test utility jdk.test.lib.util.FileUtils.areAllMountPointsAccessible needs to tolerate duplicates
Reviewed-by: alanb

! test/jdk/java/nio/file/FileStore/Basic.java
! test/lib/jdk/test/lib/util/FileUtils.java