overlay/017: test consistent st_ino/d_ino for hardlinks

Currently hardlinks do not preserve the inode number across copy up,
so hardlinks did not participate in this test so far.

Stay honest and let the test verify what is was meant to verify and
let it fail because of the fact that hardlinks inode numbers are not
constant across copy up.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

tests/overlay/017

@@ -63,8 +63,6 @@ rm -f $seqres.full
 _scratch_mkfs >>$seqres.full 2>&1
 
 # Create our test files.
-# Not dealing with hardlinks here, when hardlinks are broken they
-# should not preserve the inode number.
 lowerdir=$OVL_BASE_SCRATCH_MNT/$OVL_LOWER
 mkdir -p $lowerdir
 mkdir $lowerdir/dir
@@ -74,8 +72,10 @@ mknod $lowerdir/chrdev c 1 1
 mknod $lowerdir/blkdev b 1 1
 mknod $lowerdir/fifo p
 $here/src/af_unix $lowerdir/socket
+touch $lowerdir/hardlink1
+ln $lowerdir/hardlink1 $lowerdir/hardlink2
 
-FILES="dir file symlink chrdev blkdev fifo socket"
+FILES="dir file symlink chrdev blkdev fifo socket hardlink1 hardlink2"
 
 # Record inode numbers in format <ino> <basename>
 function record_inode_numbers()