XFS Add Punch Hole Testing to FSX

Hi all,

This is the fsx test I have been using to develop punch hole for ext4. There have been some requests to see it, so I will send it to both linux-fsdevl and the ext4 mailing list.

Ext4 punch hole is done through fallocate, so the patch adds the punch hole flag to fallocate test. Initially I had trouble enabling the existing fallocate tests until I made a fix to the Makefile. It looks like it should be checking for HAVE_FALLOCATE equal to "yes" instead of "true"? Im not sure if that was a bug or if there was something else I was supposed to do to configure it correctly, so feed back is appreciated :) Thanks all!

Allison Henderson