@Override
  public void fromData(DataInput in,
      DeserializationContext context) throws IOException, ClassNotFoundException {
    super.fromData(in, context);
    rpid = in.readInt();
  }
This ShutdownAllGatewayHubsRequest just reply with ignored bit true so that old version member's
request will be ignored and no exception will be thrown.

From 9.0 old wan support is removed. Ideally ShutdownAllGatewayHubsRequest should be removed but
it it there for rolling upgrade support when request come from old version member to shut down
hubs.

@since Geode 1.0
geode-core/src/main/java/org/apache/geode/internal/admin/remote/ShutdownAllGatewayHubsRequest.java