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

[Alan Bateman]

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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