Revert "[FIX] stock : traceback pivot view for stock moves"

This reverts commit 834b38a84d. It also reverts 003328ec82
that improved the sorted.

addons/product/models/product_attribute.py

@@ -76,7 +76,7 @@ class ProductAttributevalue(models.Model):
 
     @api.multi
     def _variant_name(self, variable_attributes):
-        return ", ".join([v.name for v in self.sorted(key=lambda r: r.attribute_id.name) if v.attribute_id in variable_attributes])
+        return ", ".join([v.name for v in self if v.attribute_id in variable_attributes])
 
 
 class ProductAttributePrice(models.Model):