bug #35323 [FrameworkBundle] Set booted flag to false when test kerne…

…l is unset (thiagocordeiro)

This PR was submitted for the 5.0 branch but it was merged into the 4.4 branch instead.

Discussion
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[FrameworkBundle] Set booted flag to false when test kernel is unset

| Q             | A
| ------------- | ---
| Branch?       | 5.0
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| License       | MIT

When `KernelTestCase::$kernel` is set to `null` `KernelTestCase::$booted` is not reseted and recreating the client is not possible because it relies on `booted` flag

Commits
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6f4684f Set booted flag to false when test kernel is unset

src/Symfony/Bundle/FrameworkBundle/Test/KernelTestCase.php

@@ -45,6 +45,7 @@ private function doTearDown()
     {
         static::ensureKernelShutdown();
         static::$kernel = null;
+        static::$booted = false;
     }
 
     /**