Add forked Maatkit tools in bin/ and their tests in t/.

t/pt-query-digest/samples/issue_611.sql

@@ -0,0 +1,8 @@
+DROP DATABASE IF EXISTS issue_611;
+CREATE DATABASE issue_611;
+USE issue_611;
+CREATE TABLE t (
+  id int primary key,
+  foo char
+) PARTITION BY KEY (id);
+INSERT INTO t VALUES (1,'a'),(2,'b'),(3,'c'),(4,'d'),(5,'e');