JDK 9 RFR of 8176237: (fs) java/nio/file/FileStore/Basic.java should conditionally check FileStores

[Chris Hegarty]

> On 9 Mar 2017, at 11:46, Alan Bateman <Alan.Bateman at oracle.com> wrote:
> 
> 
> 
> On 07/03/2017 00:28, Brian Burkhalter wrote:
>> Please review a patch for this test issue:
>> 
>> Issue:	https://bugs.openjdk.java.net/browse/JDK-8176237
>> Patch:	http://javaweb.us.oracle.com/~bburkhal/jdk9/review/8176237/webrev.00/
>> 
>> Similar to the change previously submitted in the patch for [1], attempt to access the FileStore enumeration only if “df” does not hang (Unix-only). Also move the “df” file system accessibility test code to jdk.testlibrary.FileUtils#areFileSystemsAccessible.
>> 
> Looks okay but FileUtils.areFileSystemsAccessible() needs a comment so that future users of this test infrastructure have something to read.

Also, FileUtils already has a field, `isWindows`, that can be used
rather than re-reading the `os.name` system property.

-Chris.