Change to use real_sleep to make test work in build environment

myisam/mi_extra.c:
  Fix comment
mysql-test/r/rpl_change_master.result:
  new results

myisam/mi_extra.c

@@ -33,15 +33,11 @@
     		Used when function is one of:
 		HA_EXTRA_WRITE_CACHE
 		HA_EXTRA_CACHE
-		HA_EXTRA_BULK_INSERT_BEGIN
-		  If extra_arg is 0, then the default cache size is used.
-		HA_EXTRA_BULK_INSERT_FLUSH
-		  extra_arg is a a pointer to which index to flush (uint*)
-    RETURN VALUES
-    0	ok
+  RETURN VALUES
+    0  ok
+    #  error
 */
 
-
 int mi_extra(MI_INFO *info, enum ha_extra_function function, void *extra_arg)
 {
   int error=0;

mysql-test/r/rpl_change_master.result

@@ -8,7 +8,7 @@ select get_lock("a",5);
 get_lock("a",5)
 1
 create table t1(n int);
-insert into t1 values(1+get_lock("a",10)*0);
+insert into t1 values(1+get_lock("a",15)*0);
 insert into t1 values(2);
 stop slave;
 select * from t1;

mysql-test/t/rpl_change_master.test

@@ -4,11 +4,11 @@ connection slave;
 select get_lock("a",5);
 connection master;
 create table t1(n int);
-insert into t1 values(1+get_lock("a",10)*0);
+insert into t1 values(1+get_lock("a",15)*0);
 insert into t1 values(2);
 save_master_pos;
 connection slave;
-sleep 3; # can't sync_with_master as we should be blocked
+--real_sleep 3; # can't sync_with_master as we should be blocked
 stop slave;
 select * from t1;
 --replace_result $MASTER_MYPORT MASTER_MYPORT