Base ‘% complete’ on notifications requested

The job is complete when all notifications are delivered or failed.

The report is complete once we have all notifications are in the
database.

This commit changes the meaning of the percentage from the former to the
latter. This is how it was before we removed the aggregate stats for
jobs.

tests/__init__.py

@@ -156,6 +156,7 @@ def job_json(service_id,
              original_file_name="thisisatest.csv",
              notification_count=1,
              notifications_sent=1,
+             notifications_requested=1,
              status=None):
     if job_id is None:
         job_id = str(generate_uuid())
@@ -174,6 +175,7 @@ def job_json(service_id,
         'created_at': created_at,
         'notification_count': notification_count,
         'notifications_sent': notifications_sent,
+        'notifications_requested': notifications_requested,
         'status': status,
         'created_by': created_by_json(
             created_by.id,