Fix CHANGE MASTER TO syntax

repl_manager.sh

 #!/bin/sh
 
 MASTERELECTION_NAME=${MASTERELECTION_NAME:-mariadb}
+REPL_PASSWORD=${REPL_PASSWORD:-mariadb-replication}
 
 if [ -z "${PUBLIC_ADDR}" ]; then
     echo "ERROR: PUBLIC_ADDR is undefined" >&2
@@ -30,7 +31,7 @@ become_slave() {
 
     log "Switching master to ${master_addr}"
     
-    mysql -NBe "CHANGE MASTER TO MASTER_HOST='${master_host}' MASTER_PORT=${master_port} MASTER_USER='replication' MASTER_PASS='${REPL_PASSWORD}' MASTER_CONNECT_RETRY=10 MASTER_USE_GTID=current_pos MASTER_AUTO_POSITION=1; START SLAVE"
+    mysql -NBe "CHANGE MASTER TO MASTER_HOST='${master_host}', MASTER_PORT=${master_port}, MASTER_USER='replication', MASTER_PASSWORD='${REPL_PASSWORD}', MASTER_CONNECT_RETRY=10, MASTER_USE_GTID=current_pos, MASTER_AUTO_POSITION=1; START SLAVE"
     # TODO: Wait for replication to catch up.
 }