Use get-allocated-inos in orphan-inodes test

The orphan inodes test needs to test if inode items exist as it
manipulates inodes.  It used to open the inode by a handle but we're
fixing that to not allow opening unlinked files.   The
get-allocated-inos ioctl tests for the presence of items owned by the
inode regardless of any other vfs state so we can use it to verify what
scoutfs is doing as we work with the vfs inodes.

Signed-off-by: Zach Brown <zab@versity.com>

tests/tests/orphan-inodes.sh

@@ -26,7 +26,8 @@ inode_exists()
 {
 	local ino="$1"
 
-	handle_cat "$T_M0" "$ino" > "$T_TMP.handle_cat.log" 2>&1
+	scoutfs get-allocated-inos -i "$ino" -s -p "$T_M0" > $T_TMP.inos.log 2>&1
+	test "$?" == 0 -a "$(head -1 $T_TMP.inos.log)" == "$ino"
 }
 
 echo "== test our inode existance function"