Fix resetting of managers on kernel reset

[alexander-schranz]

Not sure about this change but bin/console debug:container --parameter doctrine.entity_managers

does return in my case:

    'default' => 'doctrine.orm.default_entity_manager',

and if the value instead of key is used it will end up in a

Doctrine ORM Manager named "doctrine.orm.default_entity_manager'" does not exist.

Exception

[alcaeus]

Thanks for the PR. I was working on a fix to be merged to the 1.12.x as that's the lowest supported branch where the issue appears. See #1103.

[alexander-schranz]

@alcaeus oh sorry forget to change the target branch. Thank you for working on it 👍

[alcaeus]

No, thank YOU for working on a fix. I was writing the test when I saw your PR, but it lacked tests so I continued. Had I known you were working on a test as well I'd have stopped, but as is rebasing would've taken more time. We'll have this fixed in a few minutes.

[alexander-schranz]

@alcaeus Thx for the fast release :)