tests: Add test for current version (v5) of XFS filesystem

tests: Add test for current version (v5) of XFS filesystem

Old xfs.img cannot be used with current version (5.0) of xfsprogs, so create
a new version of xfs-v5.img.

Since I wasn't able to find logs on how was created old xfs.img, saving
create log with this commit message:

$ fallocate -l 16M xfs-v5.img
$ mkfs.xfs -L test-xfs-v5 xfs-v5.img
$ ./blkid -p -o udev xfs-v5.img | sort -V > tests/expected/blkid/low-probe-xfs-v5
$ xz -c xfs-v5.img > tests/ts/blkid/images-fs/xfs-v5.img.xz

Signed-off-by: Anatoly Pugachev <matorola@gmail.com>