message: [druid] Renaming refresh_async method
diff: @@ -122,9 +122,9 @@ class DruidCluster(Model, AuditMixinNullable):
  ds_refresh.append(datasource_name)
  else:
  return
  - self.refresh_async(ds_refresh, merge_flag, refreshAll)
  + self.refresh(ds_refresh, merge_flag, refreshAll)
  - def refresh_async(self, datasource_names, merge_flag, refreshAll):
  + def refresh(self, datasource_names, merge_flag, refreshAll):
  """
  Fetches metadata for the specified datasources andm
  merges to the Superset database
  