Make the test innodb.recovery_shutdown more robust

Before killing the server, we have to FLUSH TABLES in order to
prevent the corruption of any MyISAM system tables.

mysql-test/suite/innodb/r/recovery_shutdown.result

@@ -52,5 +52,5 @@ INSERT INTO t1(a) SELECT NULL FROM t1;
 INSERT INTO t1(a) SELECT NULL FROM t1;
 SET GLOBAL innodb_flush_log_at_trx_commit=1;
 CREATE TABLE u(a SERIAL) ENGINE=INNODB;
-# Kill and restart
+FLUSH TABLES;
 DROP TABLE t,u;

mysql-test/suite/innodb/t/recovery_shutdown.test

@@ -41,7 +41,11 @@ INSERT INTO t1(a) SELECT NULL FROM t1;
 SET GLOBAL innodb_flush_log_at_trx_commit=1;
 CREATE TABLE u(a SERIAL) ENGINE=INNODB;
 
---source include/kill_and_restart_mysqld.inc
+FLUSH TABLES;
+
+--let $shutdown_timeout=0
+--source include/restart_mysqld.inc
+--let $shutdown_timeout=60
 --source include/restart_mysqld.inc
 
 --disable_query_log