Summary:
As we start to build out both FUSE and Thrift benchmarks, we'll want a
standard library. Introduce a benchharness and have both the thrift
sha-1 and parallel_open_close benchmarks use it.
(Note: this ignores all push blocking failures!)
Differential Revision: D12969306
fbshipit-source-id: 89c8bbcc37d53560decffb9281af4aba20345787
