Fix race condition in tests between cache and lock

Author: jderusse

src/Symfony/Component/Cache/Tests/Adapter/AbstractRedisAdapterTest.php

@@ -41,7 +41,6 @@ public static function setupBeforeClass()
 
     public static function tearDownAfterClass()
     {
-        self::$redis->flushDB();
         self::$redis = null;
     }
 }

src/Symfony/Component/Cache/Tests/Adapter/PredisClusterAdapterTest.php

@@ -21,7 +21,6 @@ public static function setupBeforeClass()
 
     public static function tearDownAfterClass()
     {
-        self::$redis->getConnection()->getConnectionByKey('foo')->executeCommand(self::$redis->createCommand('FLUSHDB'));
         self::$redis = null;
     }
 }

src/Symfony/Component/Cache/Tests/Simple/AbstractRedisCacheTest.php

@@ -41,7 +41,6 @@ public static function setupBeforeClass()
 
     public static function tearDownAfterClass()
     {
-        self::$redis->flushDB();
         self::$redis = null;
     }
 }