* Use 'xfs_info' to query fs size, that doesn't always require the device be
mounted. Although still query mountpoint first for backward compatibility.
* Do not fail whith fstype=xfs and resizefs=yes if filesystem already fills
its underlying device.
* Include xfs in the tasks that test idempotency of resizefs option
* Add changelogs/fragments/1478-filesystem-fix-1457-resizefs-idempotency.yml
