filter: Introduce filter to filter out offset for xfs_io

filter: Introduce filter to filter out offset for xfs_io

Some test cases (AFAIK, btrfs RAID recovery test cases) read out
certain location to verify its data.

Such read is mostly OK, but the golden output contains the on-disk
offset, which can differ due to underlying chunk change.  (This time
is mkfs chunk layout change for btrfs)

So introduce macro _filter_xfs_io_offset to filter out the offset part
wrote 65536/65536 bytes at offset 136708096
                       ^^^^^^^^^^^^^^^^^^^^
And offset from "pread -v"
08260000:  aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa  ................
^^^^^^^^^

Only btrfs/14[0-3] are affected.

Reported-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>