Creating private function saveInventoryArticles from createAction

[Dev-Int]

Result of analysis:

 - Too Many Nested Blocks in Function Declaration 
    (It is a good practice to introduce a new function rather than to use more nested blocks).
 - And method length is 30 lines (20 allowed).

Code to move:

// Saving of the articles in the inventory
foreach ($articles as $article) {
    foreach ($article->getZoneStorages()->getSnapshot() as $zoneStorage) {
        $inventoryArticles = new InventoryArticles();
        $inventoryArticles->setArticle($article);
        $inventoryArticles->setInventory($inventory);
        $inventoryArticles->setQuantity($article->getQuantity());
        $inventoryArticles->setRealstock(0);
        $inventoryArticles->setUnitStorage($article->getUnitStorage());
        $inventoryArticles->setPrice($article->getPrice());
        $inventoryArticles->setZoneStorage($zoneStorage->getName());
        $etm->persist($inventoryArticles);
    }
}

Add the parameters for this code to work.