Fix for bug#81723

 Fixing [Bug#81723](https://bugs.mysql.com/bug.php?id=81723): Installing a container with X-Plugin enabled results with an unresponsive server.

Author: datacharmer

5.7/docker-entrypoint.sh

@@ -54,7 +54,7 @@ if [ "$1" = 'mysqld' ]; then
 			-- What's done in this file shouldn't be replicated
 			--  or products like mysql-fabric won't work
 			SET @@SESSION.SQL_LOG_BIN=0;
-			DELETE FROM mysql.user where user != 'mysql.sys';
+			DELETE FROM mysql.user WHERE user NOT IN ('mysql.sys', 'mysqlxsys');
 			CREATE USER 'root'@'%' IDENTIFIED BY '${MYSQL_ROOT_PASSWORD}' ;
 			GRANT ALL ON *.* TO 'root'@'%' WITH GRANT OPTION ;
 			DROP DATABASE IF EXISTS test ;