support multi-run test for test/webrick/test_filehandler.rb

test/webrick/test_filehandler.rb

@@ -103,6 +103,7 @@ class WEBrick::TestFileHandler < Test::Unit::TestCase
     bug2593 = '[ruby-dev:40030]'
 
     TestWEBrick.start_httpserver(config) do |server, addr, port, log|
+      server[:DocumentRootOptions][:NondisclosureName] = []
       http = Net::HTTP.new(addr, port)
       req = Net::HTTP::Get.new("/")
       http.request(req){|res|