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