Add roles and grants for MaxScale

grants/maxscale.sql

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+CREATE ROLE IF NOT EXISTS maxscale_role;
+CREATE ROLE IF NOT EXISTS maxmon_role;
+
+-- You must also create database users and grant these roles to them, e.g.
+-- CREATE USER maxscale_user@'%' IDENTIFIED BY 'the_password';
+-- CREATE USER maxmon_user@'%' IDENTIFIED BY 'the_password';
+-- GRANT maxscale_role to maxscale_user@'%';
+-- GRANT maxmon_role to maxmon_user@'%';
+-- SET DEFAULT ROLE maxscale_role FOR maxscale_user@'%';
+-- SET DEFAULT ROLE maxmon_role FOR maxmon_user@'%';
+
+GRANT SHOW DATABASES ON *.* TO maxscale_role;
+GRANT SELECT ON mysql.procs_priv TO maxscale_role;
+GRANT SELECT ON mysql.tables_priv TO maxscale_role;
+GRANT SELECT ON mysql.db TO maxscale_role;
+GRANT SELECT ON mysql.roles_mapping TO maxscale_role;
+GRANT SELECT ON mysql.columns_priv TO maxscale_role;
+GRANT SELECT ON mysql.proxies_priv TO maxscale_role;
+GRANT SELECT ON mysql.user TO maxscale_role;
+
+GRANT REPLICATION SLAVE, BINLOG MONITOR, SLAVE MONITOR ON *.* TO maxmon_role;
+GRANT SELECT ON mysql.user TO maxmon_role;