THRIFT-437. rb: fix benchmarking tools to require proper file names

A few scripts in benchmark/ and script/ were using old-style require statments.



git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@763003 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/rb/benchmark/server.rb b/lib/rb/benchmark/server.rb
index d44fa88..74e13f4 100644
--- a/lib/rb/benchmark/server.rb
+++ b/lib/rb/benchmark/server.rb
@@ -20,7 +20,7 @@
 $:.unshift File.dirname(__FILE__) + '/../lib'
 require 'thrift'
 $:.unshift File.dirname(__FILE__) + "/gen-rb"
-require 'BenchmarkService'
+require 'benchmark_service'
 
 module Server
   include Thrift