remove jobs from letter api calls

we now no longer create a job. At the end of the post there is no
action, as we don't have any tasks to queue immediately - if it's a
real notification it'll get picked up in the evening scheduled task.

If it's a test notification, we create it with an initial status of
sending so that we can be sure it'll never get picked up - and then we
trigger the update-letter-notifications-to-sent-to-dvla task to sent
the sent-at/by.

app/notifications/process_letter_notifications.py

@@ -1,38 +1,15 @@
 from app import create_random_identifier
-from app.models import LETTER_TYPE, JOB_STATUS_READY_TO_SEND, Job
-from app.dao.jobs_dao import dao_create_job
+from app.models import LETTER_TYPE
 from app.notifications.process_notifications import persist_notification
-from app.v2.errors import InvalidRequest
-from app.variables import LETTER_API_FILENAME
 
 
-def create_letter_api_job(template):
-    service = template.service
-    if not service.active:
-        raise InvalidRequest('Service {} is inactive'.format(service.id), 403)
-    if template.archived:
-        raise InvalidRequest('Template {} is deleted'.format(template.id), 400)
-
-    job = Job(
-        original_file_name=LETTER_API_FILENAME,
-        service=service,
-        template=template,
-        template_version=template.version,
-        notification_count=1,
-        job_status=JOB_STATUS_READY_TO_SEND,
-        created_by=None
-    )
-    dao_create_job(job)
-    return job
-
-
-def create_letter_notification(letter_data, template, api_key):
+def create_letter_notification(letter_data, template, api_key, status):
     notification = persist_notification(
         template_id=template.id,
         template_version=template.version,
         # we only accept addresses_with_underscores from the API (from CSV we also accept dashes, spaces etc)
         recipient=letter_data['personalisation']['address_line_1'],
-        service=job.service,
+        service=template.service,
         personalisation=letter_data['personalisation'],
         notification_type=LETTER_TYPE,
         api_key_id=api_key.id,
@@ -40,6 +17,7 @@ def create_letter_notification(letter_data, template, api_key):
         job_id=None,
         job_row_number=None,
         reference=create_random_identifier(),
-        client_reference=letter_data.get('reference')
+        client_reference=letter_data.get('reference'),
+        status=status
     )
     return notification