8013647: JPRT unable to clean-up after tests that leave file trees with loops

[Kumar Srinivasan]

Looks good.

Kumar

>
> As part of 8012930 [1], the tests for Files.walkFileTree were split 
> out into individual tests so they aren't run by a shell tests. A side 
> effect of this is that the tests leave a file tree that is problematic 
> to clean-up because it contains loops (sym links to ancestor directories).
>
> The following webrev "fixes" these four tests so that the clean up 
> after themselves:
>
> http://cr.openjdk.java.net/~alanb/8013647/webrev/
>
> Tim and Kumar are familiar with the issue and may be able to review.
>
> -Alan
>
> [1] http://hg.openjdk.java.net/jdk8/tl/jdk/rev/8b07b318f713

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