Fix conflict with dama/doctrine-test-bundle

[alexislefebvre]

See liip/LiipFunctionalTestBundle#423

---

Test code from this branch:

1. Add this in your composer.json file:

    "repositories": [
        {
            "type": "vcs",
            "url": "https://github.com/liip/LiipTestFixturesBundle.git"
        }
    ]

2. composer require --dev liip/test-fixtures-bundle:dev-fix-conflict-with-dama-doctrine-test-bundle
3. Set liip_test_fixtures.keep_database_and_schema: true in your configuration

[scaytrase]

I can confirm that this patch fixes issues other than dama/doctrine-test-bundle compatibility (I have it installed but don't have these issues before).

[alexislefebvre]

@scaytrase Thanks for the test!