Need reviewer for 6926800: TEST_BUG: java/nio/file/Files/walk_file_tree.sh fails with newer versions of find(1)

[Alan Bateman]

The test test/java/nio/file/Files/walk_file_tree.sh is failing on some 
Linux distributions. The test walks a file tree and checks that it 
visits directories and files in the same order as the find(1) utility. 
To make things interesting the test creates a file tree with cycles (sym 
links to ancestor directories) and checks behavior for the case where 
sym links are followed and not followed. When comparing the output with 
the output of find(1), the test assumes that when a cycle is encountered 
that find will print the sym link and continue (the warning to stderr is 
ignored). This assumption turns out to be no longer true on some 
distributions where find now just prints a warning. The fix proposed 
changes the test so that it works with either behavior - it first walks 
the file tree without reporting cycles. If that doesn't match the output 
of find then it walks the file tree again with an option to print 
cycles. I've put the webrev with the proposed change here:
   http://cr.openjdk.java.net/~alanb/6926800/webrev.00/

Thanks,
Alan.