Reduce thread/action count to ensure load test passes when running against VM.
Reduce thread/action count to ensure load test passes when running against VM.


Former-commit-id: 8564fb238b70eb3d578b400fca39f31a5998c9ce
rob-somerville/riak-dotnet-client,basho/riak-dotnet-client,rob-somerville/riak-dotnet-client,basho/riak-dotnet-client