minor symfony#28728 [EventDispatcher] Remove template method in test case (samnela)

This PR was merged into the 2.8 branch.

Discussion
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[EventDispatcher] Remove template method in test case

| Q             | A
| ------------- | ---
| Branch?       | 2.8 <!-- see below -->
| Bug fix?      | no
| New feature?  | no <!-- don't forget to update src/**/CHANGELOG.md files -->
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- don't forget to update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | no   <!-- #-prefixed issue number(s), if any -->
| License       | MIT
| Doc PR        | no <!-- required for new features -->

<!--
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Commits
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545a8ee [EventDispatcher] Remove template method in test case

Author: fabpot

src/Symfony/Component/EventDispatcher/Tests/GenericEventTest.php

@@ -31,8 +31,6 @@ class GenericEventTest extends TestCase
      */
     protected function setUp()
     {
-        parent::setUp();
-
         $this->subject = new \stdClass();
         $this->event = new GenericEvent($this->subject, array('name' => 'Event'));
     }
@@ -44,8 +42,6 @@ protected function tearDown()
     {
         $this->subject = null;
         $this->event = null;
-
-        parent::tearDown();
     }
 
     public function testConstruct()