PT-244 Fixed --data-dir with partitions

Made DATA DIRECTORY to be inserted at the correct place, not at the end
of the create table query.

t/pt-online-schema-change/samples/pt-244.sql

@@ -0,0 +1,10 @@
+DROP DATABASE IF EXISTS test;
+CREATE DATABASE test;
+USE test;
+
+
+CREATE TABLE t3 (
+    c INT PRIMARY KEY AUTO_INCREMENT
+) ENGINE=InnoDB PARTITION BY HASH(c) PARTITIONS 4;
+
+INSERT INTO t3 VALUES (1), (2), (3), (4), (5);