two small benchmark fixups
Merge pull request #827 from gimick/benchmark_tweaks_2

two small benchmark fixups
Set a max # of results, to avoid churn on the server.  Configurable (but not currently exposed)
Merge pull request #829 from bcipolli/limit_backend_search

Set a max # of results, to avoid churn on the server.  Configurable (but not currently exposed)