Merge pull request #11379 from mydropwizard/crm-21093

CRM-21093: Call ->initialize() on the CiviCRM service now that Drupal 8 module has changed

CRM/Utils/System/Drupal8.php

@@ -459,7 +459,7 @@ public function loadBootStrap($params = array(), $loadUser = TRUE, $throwError =
     \Drupal\Core\DrupalKernel::createFromRequest($request, $autoloader, 'prod')->prepareLegacyRequest($request);
 
     // Initialize Civicrm
-    \Drupal::service('civicrm');
+    \Drupal::service('civicrm')->initialize();
 
     // We need to call the config hook again, since we now know
     // all the modules that are listening on it (CRM-8655).