message: [testconn] Fixing response
diff: @@ -1546,7 +1546,7 @@ class Superset(BaseSupersetView):
  metrics = col.get_metrics().values()
  col.datasource.add_missing_metrics(metrics)
  db.session.commit()
  - return json_success('OK')
  + return json_success('"OK"')
  @api
  @has_access_api
  @@ -1838,7 +1838,8 @@ class Superset(BaseSupersetView):
  engine = create_engine(uri, **engine_params)
  with closing(engine.connect()) as conn:
  - return json_success(json.dumps(conn.scalar(select([1]))))
  + conn.scalar(select([1]))
  + return json_success('"OK"')
  except Exception as e:
  logging.exception(e)
  return json_error_response((
  