generic: test fsync after succession of file renames

generic: test fsync after succession of file renames

Test that after a combination of file renames, linking and creating
a new file with the old name of a renamed file, if we fsync the new
file, after a power failure we are able to mount the filesystem and
all file names correspond to the correct inodes.

This test is motivated by a bug found in btrfs which is fixed by a
patch for the linux kernel titled:

  "Btrfs: fix fsync after succession of renames of different files"

The test passes on ext4, xfs and patched btrfs, however at least in
a 5.0-rc5 linux kernel, it fails on f2fs.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>