Merge pull request #1991 from GSA/gevent

monkeypatch gevent

run_celery.py

@@ -1,6 +1,9 @@
 #!/usr/bin/env python
+from gevent import monkey
 
-from flask import Flask
+monkey.patch_all()
+
+from flask import Flask  # noqa
 
 # notify_celery is referenced from manifest_delivery_base.yml, and cannot be removed
 from app import create_app, notify_celery  # noqa