Fixed tests for php 7.x ...

Author: Geolim4

tests/Couchdb.test.php

@@ -17,8 +17,6 @@
 $config = new CouchdbConfig();
 
 try{
-    $config->setUsername('admin');
-    $config->setPassword('travis');
     $cacheInstance = CacheManager::getInstance('Couchdb', $config);
 } catch (PhpfastcacheDriverConnectException $e){
     $config->setUsername('admin');