Add a queue capacity reporter plugin to the queue. Move the queue definitions to app. Add a cloudwatch reporter to the dockerfile build queue.

workers/diffsworker.py

@@ -1,7 +1,7 @@
 import logging
 import argparse
 
-from data.queue import image_diff_queue
+from app import image_diff_queue
 from data.model import DataModelException
 from endpoints.registry import process_image_changes
 from workers.worker import Worker