Localize notification_utils to the API

This changeset pulls in all of the notification_utils code directly into the API and removes it as an external dependency.  We are doing this to cut down on operational maintenance of the project and will begin removing parts of it no longer needed for the API.

Signed-off-by: Carlo Costino <carlo.costino@gsa.gov>

app/config.py

@@ -2,10 +2,10 @@ import json
 from datetime import timedelta
 from os import getenv, path
 
-import notifications_utils
 from celery.schedules import crontab
 from kombu import Exchange, Queue
 
+import notifications_utils
 from app.cloudfoundry_config import cloud_config