MAGETWO-70667: Updated EAV Attribute code max lenght #10225

 - Merge Pull Request #10225 from okorshenko/magento2:okorshenko-patch-1
 - Merged commits:
   1. d4936a5

Author: Oleksii Korshenko

app/code/Magento/Eav/Model/Entity/Attribute.php

@@ -23,7 +23,7 @@ class Attribute extends \Magento\Eav\Model\Entity\Attribute\AbstractAttribute im
     /**
      * Attribute code max length
      */
-    const ATTRIBUTE_CODE_MAX_LENGTH = 255;
+    const ATTRIBUTE_CODE_MAX_LENGTH = 60;
 
     /**
      * Cache tag