Remove redundant add to session.

app/swarm.py

@@ -101,8 +101,8 @@ class Swarm:
         ' Poll the service until the job is completly executed.
         '''
         session = self.Session()
-        job.status = 'running'
         session.add(job)
+        job.status = 'running'
         session.commit()
         current_state = None
         while True:
@@ -112,7 +112,6 @@ class Swarm:
             time.sleep(1)
             service.reload()
         job.status = current_state
-        session.add(job)
         session.commit()
         session.close()
         # Remove the service from the swarm.