Fix user rights, no one needs to be able to create or write job log except the system.

tests/test_job_definition.py

@@ -189,3 +189,5 @@
         self.assertEqual(job_logs.filename, "text")
         self.assertEqual(job_logs.out_file, base64.b64encode(b"\ntest\n"))
         self.assertEqual(job_logs.state, "done")
+        with self.assertRaises(AccessError):
+            job_logs.filename = "No change allowed"