Lua 5.2 upgrade [1] for NSE.

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

scripts/mysql-brute.nse

@@ -1,3 +1,12 @@
+local brute = require "brute"
+local creds = require "creds"
+local mysql = require "mysql"
+local nmap = require "nmap"
+local shortport = require "shortport"
+local stdnse = require "stdnse"
+
+local openssl = stdnse.silent_require "openssl"
+
 description = [[
 Performs password guessing against MySQL.
 ]]
@@ -16,13 +25,6 @@ author = "Patrik Karlsson"
 license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
 categories = {"intrusive", "brute"}
 
-require 'shortport'
-require 'stdnse'
-require 'mysql'
-require 'brute'
-require 'creds'
-stdnse.silent_require 'openssl'
-
 -- Version 0.5
 -- Created 01/15/2010 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
 -- Revised 01/23/2010 - v0.2 - revised by Patrik Karlsson, changed username, password loop, added credential storage for other mysql scripts, added timelimit