Support selecting by worker for device stats
Support selecting by worker for device stats

nickgzzjr/simplecoin_multi,simplecrypto/simplecoin_multi,nickgzzjr/simplecoin_multi,simplecrypto/simplecoin_multi,nickgzzjr/simplecoin_multi,sigwo/simplecoin_multi,simplecrypto/simplecoin_multi,sigwo/simplecoin_multi,nickgzzjr/simplecoin_multi,sigwo/simplecoin_multi,simplecrypto/simplecoin_multi,sigwo/simplecoin_multi