Lua 5.2 upgrade [1] for NSE.

[1] http://seclists.org/nmap-dev/2012/q2/34

nselib/rsync.lua

@@ -3,11 +3,15 @@
 --
 -- @author "Patrik Karlsson <patrik@cqure.net>"
 
-module(... or "rsync",package.seeall)
+local base64 = require "base64"
+local bin = require "bin"
+local match = require "match"
+local nmap = require "nmap"
+local stdnse = require "stdnse"
+local table = require "table"
+local openssl = stdnse.silent_require "openssl"
+_ENV = stdnse.module("rsync", stdnse.seeall)
 
-require 'base64'
-require 'match'
-stdnse.silent_require 'openssl'
 
 -- The Helper class serves as the main interface for script writers
 Helper = {
@@ -166,4 +170,6 @@ Helper = {
 	-- @return status true on success, false on failure
 	disconnect = function(self) return self.socket:close() end,
 	
-}
+}
+
+return _ENV;