Fixes #3055: Update memcache settings to match changes in Drupal memc…

…ache module. (#3058) (#3067)

* Require drupa/memcache equal or greater than 2.0-alpha7.
* Updating memcache settings based on change in drupal/memcache module.

composer.suggested.json

@@ -13,7 +13,7 @@
     "drupal/cog": "^1.0.0",
     "drupal/devel": "^1.0.0",
     "drupal/qa_accounts": "^1.0.0-alpha1",
-    "drupal/memcache": "^2.0-alpha5",
+    "drupal/memcache": "^2.0-alpha7",
     "drupal/seckit": "^1.0.0-alpha2",
     "drupal/security_review": "*",
     "drupal/shield": "^1.0.0",

settings/memcache.settings.php

@@ -37,12 +37,12 @@
           'class' => 'Drupal\Core\Site\Settings',
           'factory' => 'Drupal\Core\Site\Settings::getInstance',
         ],
-        'memcache.config' => [
-          'class' => 'Drupal\memcache\DrupalMemcacheConfig',
+        'memcache.settings' => [
+          'class' => 'Drupal\memcache\MemcacheSettings',
           'arguments' => ['@settings'],
         ],
         'memcache.backend.cache.factory' => [
-          'class' => 'Drupal\memcache\DrupalMemcacheFactory',
+          'class' => 'Drupal\memcache\MemcacheDriverFactory',
           'arguments' => ['@memcache.config'],
         ],
         'memcache.backend.cache.container' => [