MAGETWO-71223: Deprecate getResource and getCollection

- restore  implemented methods

Author: cpartica

app/code/Magento/Catalog/Model/Product/Option.php

@@ -143,6 +143,17 @@ public function __construct(
         );
     }
 
+    /**
+     * Get resource instance
+     *
+     * @return \Magento\Framework\Model\ResourceModel\Db\AbstractDb
+     * @deprecated because resource models should be used directly
+     */
+    protected function _getResource()
+    {
+        return $this->_resource ?: parent::_getResource();
+    }
+
     /**
      * @return void
      */

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

@@ -364,6 +364,17 @@ public function getDefaultGroupId($setId = null)
         return $setId ? $this->_getResource()->getDefaultGroupId($setId) : null;
     }
 
+    /**
+     * Get resource instance
+     *
+     * @return \Magento\Framework\Model\ResourceModel\Db\AbstractDb
+     * @deprecated because resource models should be used directly
+     */
+    protected function _getResource()
+    {
+        return $this->_resource ?: parent::_getResource();
+    }
+
     /**
      * {@inheritdoc}
      * @codeCoverageIgnoreStart