Cleanup: fix race in rename.test.

mysql-test/r/rename.result:
  Update result.
mysql-test/t/rename.test:
  Remove the race by replacing sleep with a reap.

mysql-test/r/rename.result

@@ -54,3 +54,4 @@ Tables_in_test
 t2
 t4
 drop table t2, t4;
+End of 4.1 tests

mysql-test/t/rename.test

@@ -61,9 +61,15 @@ connection con2;
 sleep 1;
 show tables;
 UNLOCK TABLES;
-sleep 1;
+connection con1;
+reap;
+connection con2;
 show tables;
 
 drop table t2, t4;
 
-# End of 4.1 tests
+disconnect con2;
+disconnect con1;
+connection default;
+
+--echo End of 4.1 tests