minor symfony#16227 [PhpUnit] exit gracefully to workaround segfaults at shutdown time (nicolas-grekas)

This PR was merged into the 2.8 branch.

Discussion
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[PhpUnit] exit gracefully to workaround segfaults at shutdown time

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
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1a93494 [PhpUnit] exit gracefully to workaround segfaults at shutdown time

Author: nicolas-grekas

Diff for: src/Symfony/Bridge/PhpUnit/SymfonyTestsListener.php

@@ -52,7 +52,8 @@ public function startTestSuite(\PHPUnit_Framework_TestSuite $suite)
                     $this->state = 2;
 
                     if (!$this->wasSkipped = require $this->skippedFile) {
-                        exit("All tests already ran successfully.\n");
+                        echo "All tests already ran successfully.\n";
+                        $suite->setTests(array());
                     }
                 }
             }