pep8

docs/dump-openapi-spec.py

 import json
 import os
-import sys
 
 from fastapi.testclient import TestClient
 import resource_management
@@ -20,6 +19,6 @@ rsp = client.get('/openapi.json')
 openapi_doc = json.dumps(rsp.json(), indent=2)
 
 with open(output_filename, 'w') as f:
-  f.write(openapi_doc)
+    f.write(openapi_doc)
 
 print(f'wrote {output_filename}')