Fixes for table-checksum

t/pt-table-checksum/samples/issue_1485195.sql

@@ -1,3 +1,11 @@
 DROP DATABASE IF EXISTS my_binary_database; 
 CREATE DATABASE my_binary_database CHARSET=binary;
+USE my_binary_database;
 
+CREATE TABLE `sentinel` (
+  `id` int(11) NOT NULL,
+  `ping` varchar(64) NOT NULL DEFAULT '',
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1;
+
+INSERT INTO sentinel VALUES(1, '231f9da77ba0bf7e517b790334433cd3');