Update the job_status to in-progress sooner.

We had a situation where the delivery-worker app instance was terminated before the job was marked as `in-progress`, presumably because the query to check the daily limits was taking too long to complete.
If the job was in progress the `check_job_status` task would have restarted the job.
Updating the status to in-progress sooner will help.

app/celery/tasks.py

@@ -71,6 +71,10 @@ def process_job(job_id, sender_id=None):
 
     service = job.service
 
+    job.job_status = JOB_STATUS_IN_PROGRESS
+    job.processing_started = start
+    dao_update_job(job)
+
     if not service.active:
         job.job_status = JOB_STATUS_CANCELLED
         dao_update_job(job)
@@ -81,10 +85,6 @@ def process_job(job_id, sender_id=None):
     if __sending_limits_for_job_exceeded(service, job, job_id):
         return
 
-    job.job_status = JOB_STATUS_IN_PROGRESS
-    job.processing_started = start
-    dao_update_job(job)
-
     recipient_csv, template, sender_id = get_recipient_csv_and_template_and_sender_id(job)
 
     current_app.logger.info("Starting job {} processing {} notifications".format(job_id, job.notification_count))