Add script arguments to --script-help

[Paulino Calderon <paulino () calderonpale com>]

Hi,

I've always thought the --script-help command should give you the script 
arguments so I don't have to look them up when I don't remember/know the 
argument variables.

For example the current output gives:
./nmap --script-help http-brute

Starting Nmap 6.26SVN ( http://nmap.org ) at 2013-04-30 20:51 CDT

http-brute
Categories: intrusive brute
http://nmap.org/nsedoc/scripts/http-brute.html
  Performs brute force password auditing against http basic authentication.


This patch includes the script arguments as follows:
http-brute
Categories: intrusive brute
http://nmap.org/nsedoc/scripts/http-brute.html
  Performs brute force password auditing against http basic authentication.
Script Arguments:
   http-brute.path points to the path protected by authentication 
(default: /)
   http-brute.hostname sets the host header in case of virtual hosting
   http-brute.method sets the HTTP method to use (default: GET)


Feel free to suggest improvements to the code, it's a starting point. I 
couldn't find the @args tags loaded anywhere else so I grabbed them from 
the file ( Maybe not the most efficient way? )

Cheers.

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