Fix phpdoc and coding standards

This removes the unused use statements which were not catched by
PHP-CS-Fixer because of string occurences. It also fixes some invalid
phpdoc (scalar is not recognized as a valid type for instance).

Author: stof

Tests/Mapping/ClassMetadataFactoryTest.php

@@ -11,7 +11,6 @@
 
 namespace Symfony\Component\Validator\Tests\Mapping;
 
-use Symfony\Component\Validator\Tests\Fixtures\Entity;
 use Symfony\Component\Validator\Tests\Fixtures\ConstraintA;
 use Symfony\Component\Validator\Mapping\ClassMetadataFactory;
 use Symfony\Component\Validator\Mapping\ClassMetadata;

Tests/Mapping/ClassMetadataTest.php

@@ -14,8 +14,6 @@
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\Constraints\Valid;
 use Symfony\Component\Validator\Mapping\ClassMetadata;
-use Symfony\Component\Validator\Exception\GroupDefinitionException;
-use Symfony\Component\Validator\Tests\Fixtures\Entity;
 use Symfony\Component\Validator\Tests\Fixtures\ConstraintA;
 use Symfony\Component\Validator\Tests\Fixtures\ConstraintB;
 use Symfony\Component\Validator\Tests\Fixtures\PropertyConstraint;