unit test to create constraint on forced lowercase table in oracle

This might be crazy - but this was working in the 2.3.x code basis.

On master as well as 2.4.2 following error is throws:
````
Exception : [Doctrine\DBAL\Exception\TableNotFoundException] An exception occurred while executing 'DECLARE
  constraints_Count NUMBER;
BEGIN
  SELECT COUNT(CONSTRAINT_NAME) INTO constraints_Count FROM USER_CONSTRAINTS WHERE TABLE_NAME = '"OC_STORAGES"' AND CONSTRAINT_TYPE = 'P';
  IF constraints_Count = 0 OR constraints_Count = '' THEN
    EXECUTE IMMEDIATE 'ALTER TABLE "OC_STORAGES" ADD CONSTRAINT "OC_STORAGES_AI_PK" PRIMARY KEY ("NUMERIC_ID")';
  END IF;
END;':

ORA-00942: table or view does not exist
ORA-06512: at line 6

With queries:
6. SQL: 'DECLARE
  constraints_Count NUMBER;
BEGIN
  SELECT COUNT(CONSTRAINT_NAME) INTO constraints_Count FROM USER_CONSTRAINTS WHERE TABLE_NAME = '"OC_STORAGES"' AND CONSTRAINT_TYPE = 'P';
  IF constraints_Count = 0 OR constraints_Count = '' THEN
    EXECUTE IMMEDIATE 'ALTER TABLE "OC_STORAGES" ADD CONSTRAINT "OC_STORAGES_AI_PK" PRIMARY KEY ("NUMERIC_ID")';
  END IF;
END;' Params: 
5. SQL: 'CREATE TABLE "oc_storages" ("id" VARCHAR2(64) NOT NULL, "numeric_id" NUMBER(10) NOT NULL, PRIMARY KEY("id"))' Params: 
4. SQL: 'DROP TABLE "oc_storages"' Params: 
3. SQL: 'DROP TRIGGER "OC_STORAGES"_AI_PK' Params: 
2. SQL: 'ALTER SESSION SET NLS_TIME_FORMAT = 'HH24:MI:SS' NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS' NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH24:MI:SS' NLS_TIMESTAMP_TZ_FORMAT = 'YYYY-MM-DD HH24:MI:SS TZH:TZM' NLS_NUMERIC_CHARACTERS = '.,'' Params: 

Trace:
/home/deepdiver/Development/ownCloud/dbal/lib/Doctrine/DBAL/DBALException.php:116
/home/deepdiver/Development/ownCloud/dbal/lib/Doctrine/DBAL/Connection.php:988
/home/deepdiver/Development/ownCloud/dbal/lib/Doctrine/DBAL/Schema/AbstractSchemaManager.php:971
/home/deepdiver/Development/ownCloud/dbal/lib/Doctrine/DBAL/Schema/AbstractSchemaManager.php:429
/home/deepdiver/Development/ownCloud/dbal/lib/Doctrine/DBAL/Schema/AbstractSchemaManager.php:569
/home/deepdiver/Development/ownCloud/dbal/tests/Doctrine/Tests/DBAL/Functional/Schema/OracleSchemaManagerTest.php:118

#0 /home/deepdiver/Development/ownCloud/dbal/vendor/phpunit/phpunit/PHPUnit/Framework/TestCase.php(946): Doctrine\Tests\DbalFunctionalTestCase->onNotSuccessfulTest(Object(Doctrine\DBAL\Exception\TableNotFoundException))
#1 /home/deepdiver/Development/ownCloud/dbal/vendor/phpunit/phpunit/PHPUnit/Framework/TestResult.php(648): PHPUnit_Framework_TestCase->runBare()
#2 /home/deepdiver/Development/ownCloud/dbal/vendor/phpunit/phpunit/PHPUnit/Framework/TestCase.php(776): PHPUnit_Framework_TestResult->run(Object(Doctrine\Tests\DBAL\Functional\Schema\OracleSchemaManagerTest))
#3 /home/deepdiver/Development/ownCloud/dbal/vendor/phpunit/phpunit/PHPUnit/Framework/TestSuite.php(775): PHPUnit_Framework_TestCase->run(Object(PHPUnit_Framework_TestResult))
#4 /home/deepdiver/Development/ownCloud/dbal/vendor/phpunit/phpunit/PHPUnit/Framework/TestSuite.php(745): PHPUnit_Framework_TestSuite->runTest(Object(Doctrine\Tests\DBAL\Functional\Schema\OracleSchemaManagerTest), Object(PHPUnit_Framework_TestResult))
#5 /home/deepdiver/Development/ownCloud/dbal/vendor/phpunit/phpunit/PHPUnit/TextUI/TestRunner.php(349): PHPUnit_Framework_TestSuite->run(Object(PHPUnit_Framework_TestResult), '/::testConstrai...', Array, Array, false)
#6 /usr/share/php/PHPUnit/TextUI/Command.php(176): PHPUnit_TextUI_TestRunner->doRun(Object(PHPUnit_Framework_TestSuite), Array)
#7 /tmp/ide-phpunit.php(268): PHPUnit_TextUI_Command->run(Array, true)
#8 /tmp/ide-phpunit.php(506): IDE_Base_PHPUnit_TextUI_Command::main()
#9 {main}
````