Simple sharding tutorial is out of date

The simple sharding tutorial is out of date as it does not mention that auth_all_servers must be enabled. In MaxScale 6, it must be enabled manually as the schemarouter no longer modifies the service configuration directly.

Original title:
connection to shard should work with mariadb client tools

Original description:
When I run these tests against MaxScale with SchemaRouter I get errors in some cases (as the documentation states):

mariadb --user=app --password=secret --host=10.153.125.219 --port=3306
mariadb --user=app --password=secret --host=10.153.125.219 --port=3306 --database=customer_0010
mariadb --user=app --password=secret --host=10.153.125.219 --port=3306 --database=customer_0020
ERROR 1049 (42000): Unknown database 'customer_0020'
mariadb --user=app --password=secret --host=10.153.125.219 --port=3306 --execute='use customer_0020'
mariadb --user=app --password=secret --host=10.153.125.219 --port=3306 customer_0010
mariadb --user=app --password=secret --host=10.153.125.219 --port=3306 customer_0020
ERROR 1049 (42000): Unknown database 'customer_0020'

But in theses (erroneous) cases MaxScale exactly knows where to route me.

So for compatibility reasons MaxScale should behave like a normal database and route me correctly to the target shard.