Add new module to test TNS poison (tnspoison_checker)

This module simply checks the server for vulnerabilities like TNS Poison
bug description: http://seclists.org/fulldisclosure/2012/Apr/343
There is no `'Company'` key for `update_info`. You can note your association as a `# comment` after your author name, if you like. Also, your author field should contain an e-mail address so people who have trouble with your module can get in touch with you. IOW,

```ruby
'Author'         => ['Kelesis Nikita <your[at]mail.address>'], # Of http://dsec.ru
```

Or something like that.