rb: split up benchmark into separate server/client files and distinct interpreters


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@669025 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/rb/Rakefile b/lib/rb/Rakefile
index 04aaff7..ba0fe8c 100644
--- a/lib/rb/Rakefile
+++ b/lib/rb/Rakefile
@@ -37,5 +37,5 @@
 
 desc 'Run benchmarking of NonblockingServer'
 task :benchmark do
-  ruby 'benchmark/fairness.rb'
+  ruby 'benchmark/benchmark.rb'
 end