Detect services using non-default ports

[Jiab77]

Hello @takuzoo3868, I just looked at the code inside your scanning modules and seen that you are expecting detected service from nmap to be running under it's default port but what if for example SSH is not running on port 22? or same with FTP not running on port 21?

Ref: https://github.com/takuzoo3868/penta/blob/master/penta/modules/scan_nmap.py

I really like the idea behind your project and the way the code is written but if you were relying more on returned headers than the default port itself, you might be able to detect / handle much more services.

I'm a python beginner but I would be pleased to contribute to your project.