XFSTESTS FUSE patch

This patch adds FUSE support to XFSTESTS.

Note that the patch hasn't been updated to match the latest release.

How to use?

To test passthrough_ll (libfuse/examples):

Apply the patch like git am <path-to-xfstests-fuse-patch.patch>
Follow the instructions given in README
Follow the instructions given in README.fuse