devmapper: don't create too new xfs
devmapper: don't create too new xfs

Since the update to Debian Stretch, devmapper unit test fails. One
reason is, the combination of somewhat old (less than 3.16) kernel and
relatively new xfsprogs leads to creating a filesystem which is not supported
by the kernel:

> [12206.467518] XFS (dm-1): Superblock has unknown read-only compatible features (0x1) enabled.
> [12206.472046] XFS (dm-1): Attempted to mount read-only compatible filesystem read-write.
> Filesystem can only be safely mounted read only.
> [12206.472079] XFS (dm-1): SB validate failed with error 22.

Ideally, that would be automatically and implicitly handled by xfsprogs.
In real life, we have to take care about it here. Sigh.

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

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