mount: fix try_remap_mount

Remaps in mnt_remap_list should follow same descending order which was
setup in mnt_resort_siblings(), so don't reorder them.

For instance if we have sibling mounts with mountpoints:
1) /dir1/dir2/dir3
2) /dir1/dir2
3) /dir1
Here (2) is sibling-overmount for (1). Mount (3) is sibling-overmount
for both (1) and (2). So when we move overmounts back in
fixup_remap_mounts() we should first move (2) and only then (3).
Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/mount.c

@@ -2507,7 +2507,7 @@ static int try_remap_mount(struct mount_info *m)
 		return -1;
 
 	r->mi = m;
-	list_add(&r->node, &mnt_remap_list);
+	list_add_tail(&r->node, &mnt_remap_list);
 
 	return 0;
 }