Rename *CacheDriver to *Cache because they don't act as driver anymore

tests/src/Core/Cache/MemcachedCacheDriverTest.php

@@ -1,35 +0,0 @@
-<?php
-
-
-namespace Friendica\Test\src\Core\Cache;
-
-use Friendica\Core\Cache\MemcachedCacheDriver;
-use Friendica\Core\Config\Configuration;
-use Psr\Log\NullLogger;
-
-/**
- * @requires extension memcached
- */
-class MemcachedCacheDriverTest extends MemoryCacheTest
-{
-	protected function getInstance()
-	{
-		$configMock = \Mockery::mock(Configuration::class);
-
-		$configMock
-			->shouldReceive('get')
-			->with('system', 'memcached_hosts')
-			->andReturn([0 => 'localhost, 11211']);
-
-		$logger = new NullLogger();
-
-		$this->cache = new MemcachedCacheDriver('localhost', $configMock, $logger);
-		return $this->cache;
-	}
-
-	public function tearDown()
-	{
-		$this->cache->clear(false);
-		parent::tearDown();
-	}
-}