btrfs: incremental send after moving a directory

btrfs: incremental send after moving a directory

Test that an incremental send operation works after moving a
directory into a new parent directory, deleting its previous parent
directory and creating a new inode that has the same inode number as
the old parent.

This issue is fixed by the following patch for the linux kernel:

  "Btrfs: incremental send, do not delay rename when parent inode is new"

Signed-off-by: Robbie Ko <robbieko@synology.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>