Support overlayfs testing.

[Li Mengyang]

Hi,
 Recently people are proposing overlayfs for inclusion into the mainline, I
found it could be helpful if xfstests supports overlayfs testing. Here is
the patch and example configuration file for that. Thank you.

-- 
Regards,
Li
--------------------------------------
Mengyang Li / Computer Science, SUNYSB

6315047325/ li.mengyang at stonybrook.edu
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