Added timeouts to make lock test repeatable

mysql-test/r/lock.result

@@ -5,6 +5,6 @@ test.t1	check	status	OK
 Table	Op	Msg_type	Msg_text
 test.t2	check	error	Table 't2' was not locked with LOCK TABLES
 n
-1
+4
 n
 1

mysql-test/t/lock.test

@@ -66,8 +66,10 @@ lock tables t1 write;
 connection writer;
 send update low_priority t1 set n = 4;
 connection reader;
+--sleep 2
 send select n from t1;
 connection locker;
+--sleep 2
 unlock tables;
 connection writer;
 reap;
@@ -82,8 +84,10 @@ lock tables t1 read;
 connection writer;
 send update low_priority t1 set n = 4;
 connection reader;
+--sleep 2
 send select n from t1;
 connection locker;
+--sleep 2
 unlock tables;
 connection writer;
 reap;