Remove unneccessary '&'s before template params in AsyncParallelFor test.
Remove unneccessary '&'s before template params in AsyncParallelFor test.

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