[PATCH 0/4, V2] xfstests: fsx is fallocate challenged

[Dave Chinner]

This is a repost of the fsx fallocate/fpunch operation handling
fixes along with additional tests added to 091 to cover the failing
test cases that exposed the fallocate/fpunch operation handling
problems.

Version 2 fixes the review coments of the first version. The main
change is to re-number all the operations and use those directly to
generate the operations to execute.