UPGRADE FROM 2.2 to 2.3
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Commands
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 * The `\Doctrine\Bundle\DoctrineBundle\Command\Proxy\ClearMetadataCacheDoctrineCommand` (`doctrine:cache:clear-metadata`) is deprecated, metadata cache now uses PHP Array cache which can not be cleared.

Configuration
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 * The `metadata_cache_driver` configuration key has been deprecated. PHP Array cache is now automatically registered when `%kernel.debug%` is false.

DependencyInjection
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 * `\Doctrine\Bundle\DoctrineBundle\Dbal\BlacklistSchemaAssetFilter` has been deprecated. Implement your own include/exclude strategies.
 * `\Doctrine\Bundle\DoctrineBundle\DependencyInjection\Compiler\WellKnownSchemaFilterPass` has been deprecated. Implement your own include/exclude strategies.