MC-33275 Stale cache implementation

Author: vzabaznov

setup/src/Magento/Setup/Model/ConfigOptionsList/Cache.php

@@ -97,7 +97,6 @@ public function __construct(RedisConnectionValidator $redisValidator)
      */
     public function getOptions()
     {
-        $a = \Magento\Framework\Cache\Backend\Redis::class;
         return [
             new SelectConfigOption(
                 self::INPUT_KEY_CACHE_BACKEND,

setup/src/Magento/Setup/Test/Unit/Model/ConfigOptionsList/CacheTest.php

@@ -99,7 +99,7 @@ public function testCreateConfigCacheRedis()
             'cache' => [
                 'frontend' => [
                     'default' => [
-                        'backend' => '\\Magento\\Framework\\Cache\\Backend\Redis',
+                        'backend' => \Magento\Framework\Cache\Backend\Redis::class,
                         'backend_options' => [
                             'server' => '',
                             'port' => '',
@@ -130,7 +130,7 @@ public function testCreateConfigWithRedisConfig()
             'cache' => [
                 'frontend' => [
                     'default' => [
-                        'backend' => '\\Magento\\Framework\\Cache\\Backend\Redis',
+                        'backend' => \Magento\Framework\Cache\Backend\Redis::class,
                         'backend_options' => [
                             'server' => 'localhost',
                             'port' => '1234',

setup/src/Magento/Setup/Test/Unit/Model/ConfigOptionsList/PageCacheTest.php

@@ -91,9 +91,9 @@ public function testCreateConfigWithRedis()
             'cache' => [
                 'frontend' => [
                     'page_cache' => [
-                        'backend' => '\\Magento\\Framework\\Cache\\Backend\Redis',
+                        'backend' => \Magento\Framework\Cache\Backend\Redis::class,
                         'backend_options' => [
-                            'server'=> '',
+                            'server' => '',
                             'port' => '',
                             'database' => '',
                             'compress_data' => '',
@@ -120,7 +120,7 @@ public function testCreateConfigWithRedisConfiguration()
             'cache' => [
                 'frontend' => [
                     'page_cache' => [
-                        'backend' => '\\Magento\\Framework\\Cache\\Backend\Redis',
+                        'backend' => \Magento\Framework\Cache\Backend\Redis::class,
                         'backend_options' => [
                             'server' => 'foo.bar',
                             'port' => '9000',