Add extra checks of Last_errno in SHOW SLAVE STATUS for extra

diagnostics 

mysql-test/suite/rpl_ndb/r/rpl_ndb_circular.result

@@ -5,12 +5,15 @@ reset slave;
 drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
 start slave;
 RESET MASTER;
+Last errno after reset master on slave: 0
 CHANGE MASTER TO master_host="127.0.0.1",master_port=SLAVE_PORT,master_user="root";
 START SLAVE;
+Last errno after start slave: 0
 CREATE TABLE t1 (a int key, b int) ENGINE=ndb;
 SHOW TABLES;
 Tables_in_test
 t1
+Last errno after table on both: 0
 INSERT INTO t1 VALUES (1,2);
 INSERT INTO t1 VALUES (2,3);
 SELECT * FROM t1 ORDER BY a;

mysql-test/suite/rpl_ndb/t/rpl_ndb_circular.test

@@ -5,11 +5,22 @@
 
 --connection slave
 RESET MASTER;
+
+# Check Last_errno
+let $the_last_errno= query_get_value(SHOW SLAVE STATUS, Last_Errno, 1);
+echo Last errno after reset master on slave: $the_last_errno;
+
 --connection master
+
 --replace_result $SLAVE_MYPORT SLAVE_PORT
 --eval CHANGE MASTER TO master_host="127.0.0.1",master_port=$SLAVE_MYPORT,master_user="root"
 START SLAVE;
 
+
+# Check Last_errno
+let $the_last_errno= query_get_value(SHOW SLAVE STATUS, Last_Errno, 1);
+echo Last errno after start slave: $the_last_errno;
+
 # create the table on the "slave"
 --connection slave
 CREATE TABLE t1 (a int key, b int) ENGINE=ndb;
@@ -20,6 +31,10 @@ CREATE TABLE t1 (a int key, b int) ENGINE=ndb;
 # now we should have a table on the master as well
 SHOW TABLES;
 
+# Check Last_errno
+let $the_last_errno= query_get_value(SHOW SLAVE STATUS, Last_Errno, 1);
+echo Last errno after table on both: $the_last_errno;
+
 # insert some values on the slave and master
 --connection master
 INSERT INTO t1 VALUES (1,2);