fix StealQueue to use new stats dump with ostream
fix StealQueue to use new stats dump with ostream

uwsampa/grappa,uwsampa/grappa,buaasun/grappa,uwsampa/grappa,buaasun/grappa,buaasun/grappa,buaasun/grappa,buaasun/grappa,uwsampa/grappa,alexfrolov/grappa,uwsampa/grappa,buaasun/grappa,alexfrolov/grappa,uwsampa/grappa,alexfrolov/grappa,uwsampa/grappa,alexfrolov/grappa,alexfrolov/grappa,alexfrolov/grappa,alexfrolov/grappa,buaasun/grappa