Eliminate log_slave_updates system variable, closes julien-duponchelle#410

- `log_slave_updates` modifies to which file binlog events is written.
- The variable is not applicable to python-mysql-replication, because no file is written

Author: dongwook-chan

docker-compose-test.yml

@@ -8,7 +8,7 @@ services:
       MYSQL_DATABASE: pymysqlreplication_test
     ports:
       - 3306:3306
-    command: mysqld --log-bin=mysql-bin.log --server-id 1 --binlog-format=row --gtid_mode=on --enforce-gtid-consistency=on --log_slave_updates
+    command: mysqld --log-bin=mysql-bin.log --server-id 1 --binlog-format=row --gtid_mode=on --enforce-gtid-consistency=on
     restart: always
     networks:
       - default
@@ -20,7 +20,7 @@ services:
       MYSQL_DATABASE: pymysqlreplication_test
     ports:
       - 3307:3307
-    command: mysqld --log-bin=mysql-bin.log --server-id 1 --binlog-format=row --gtid_mode=on --enforce-gtid-consistency=on --log_slave_updates -P 3307
+    command: mysqld --log-bin=mysql-bin.log --server-id 1 --binlog-format=row --gtid_mode=on --enforce-gtid-consistency=on -P 3307
 
   pymysqlreplication:
     build:

docker-compose.yml

@@ -6,15 +6,15 @@ services:
       MYSQL_ALLOW_EMPTY_PASSWORD: true
     ports:
       - 3306:3306
-    command: mysqld --log-bin=mysql-bin.log --server-id 1 --binlog-format=row --gtid_mode=on --enforce-gtid-consistency=on --log_slave_updates
+    command: mysqld --log-bin=mysql-bin.log --server-id 1 --binlog-format=row --gtid_mode=on --enforce-gtid-consistency=on
 
   percona-5.7-ctl:
     image: percona:5.7
     environment:
       MYSQL_ALLOW_EMPTY_PASSWORD: true
     ports:
       - 3307:3307
-    command: mysqld --log-bin=mysql-bin.log --server-id 1 --binlog-format=row --gtid_mode=on --enforce-gtid-consistency=on --log_slave_updates -P 3307
+    command: mysqld --log-bin=mysql-bin.log --server-id 1 --binlog-format=row --gtid_mode=on --enforce-gtid-consistency=on -P 3307
 
   mariadb-10.6:
     image: mariadb:10.6