[8u] RFR: 8232178: MacVolumesTest failed after upgrade to MacOS Catalina

[Alex Kashchenko]

Hi,

Please review this small test-only backport:

Bug: https://bugs.openjdk.java.net/browse/JDK-8232178

Original commit: https://hg.openjdk.java.net/jdk/jdk/rev/19744a63c295

8u webrev: https://cr.openjdk.java.net/~akasko/jdk8u/8232178/webrev.00/

Patch needs to be applied on top of JDK-8231254, that was recently
reviewed and intended to be pushed along with this one. 8u adjustments
are to paths and changing Path.of to Paths.get.

Testing: checked that updated test passes on macOS 10.15 .

-- 
-Alex