rb: Silence WEBrick output in specs

rb/spec/integration/selenium/webdriver/spec_support/rack_server.rb

@@ -50,7 +50,7 @@ def start
         end
 
         def run
-          handler.run @app, :Host => @host, :Port => @port
+          handler.run @app, run_options_for(handler)
         end
 
         def where_is(file)
@@ -90,6 +90,16 @@ def load_handler(handler)
           false
         end
 
+        def run_options_for(handler)
+          run_opts = {:Host => @host, :Port => @port}
+
+          if handler == Rack::Handler::WEBrick
+            run_opts.merge!(:Logger => WEBrick::Log.new("/dev/null"), :AccessLog => [])
+          end
+
+          run_opts
+        end
+
         def start_forked
           @pid = fork { run }
         end