bug symfony#19129 Avoid phpunit 5.4 warnings on getMock (master) (iltar)

This PR was merged into the 3.2-dev branch.

Discussion
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Avoid phpunit 5.4 warnings on getMock (master)

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#19125
| License       | MIT
| Doc PR        | ~

Avoids calling `getMock()` in phpunit 5.4 which will trigger a warning (and thus failing test suite) when used by developers as this TestCase is an extension point.

_in the other branches (opposed to symfony#19128), this was not in the `Test` namespace yet but in `Tests`. Therefore I've only added this in the master as changed by @wouterj in e938361._

Commits
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eb8c27e Avoid phpunit 5.4 warnings on getMock

Author: nicolas-grekas

src/Symfony/Component/Validator/Test/ConstraintValidatorTestCase.php

@@ -93,9 +93,9 @@ protected function restoreDefaultTimezone()
 
     protected function createContext()
     {
-        $translator = $this->getMock('Symfony\Component\Translation\TranslatorInterface');
-        $validator = $this->getMock('Symfony\Component\Validator\Validator\ValidatorInterface');
-        $contextualValidator = $this->getMock('Symfony\Component\Validator\Validator\ContextualValidatorInterface');
+        $translator = $this->getMockBuilder('Symfony\Component\Translation\TranslatorInterface')->getMock();
+        $validator = $this->getMockBuilder('Symfony\Component\Validator\Validator\ValidatorInterface')->getMock();
+        $contextualValidator = $this->getMockBuilder('Symfony\Component\Validator\Validator\ContextualValidatorInterface')->getMock();
 
         $context = new ExecutionContext($validator, $this->root, $translator);
         $context->setGroup($this->group);