fix subnet redis key name

inventory_provider/tasks/worker.py

@@ -553,7 +553,7 @@ def _build_subnet_db(update_callback=lambda s: None):
     for k in r.scan_iter('reverse_interface_addresses:*'):
         info = r.get(k.decode('utf-8')).decode('utf-8')
         info = json.loads(info)
-        entry = subnets.setdefault('subnet', [])
+        entry = subnets.setdefault(info['interface address'], [])
         entry.append({
             'interface name': info['interface name'],
             'router': info['router']