Merge pull request #700 from picospuch/master

fix some errors in mysql setup file for latest mysql image

mysql/startup

 DROP USER IF EXISTS 'MYSQL_USER'; 
-CREATE USER 'MYSQL_USER'@'%'; 
-CREATE DATABASE IF NOT EXISTS MYSQL_DATABASE; 
-GRANT ALL ON MYSQL_DATABASE.* TO 'MYSQL_USER'@'%' IDENTIFIED BY 'MYSQL_PASSWORD';
+CREATE USER 'MYSQL_USER'@'%' IDENTIFIED BY 'MYSQL_PASSWORD'; 
+CREATE DATABASE IF NOT EXISTS `MYSQL_DATABASE`; 
+GRANT ALL ON `MYSQL_DATABASE`.* TO 'MYSQL_USER'@'%';