MAGETWO-92720: E-mail admin users when a new administrator is created.

Author: Oleksandr Gorkun

app/code/Magento/User/Model/User.php

@@ -434,6 +434,7 @@ public function sendPasswordResetConfirmationEmail()
     /**
      * Send email to when password is resetting
      *
+     * @throws NotificationExceptionInterface
      * @return $this
      * @deprecated 100.1.0
      */
@@ -457,7 +458,7 @@ public function sendNotificationEmailsIfRequired()
             $this->notificator->sendCreated($this);
         } elseif ($changes = $this->createChangesDescriptionString()) {
             //User changed.
-            $this->sendUserNotificationEmail($changes);
+            $this->notificator->sendUpdated($this, explode(', ', $changes));
         }
 
         return $this;