Merge pull request #2424 from jzelinskie/qss-image

workers.securityworker: revert to image querying

data/model/image.py

@@ -490,7 +490,7 @@ def total_image_count():
   return Image.select().count()
 
 
-def get_image_id():
+def get_image_pk_field():
   """ Returns the primary key for Image DB model """
   return Image.id