Add RDPPort to vagrant winrm-config

[fnichol]

Hello, and thank you for this Vagrant plugin, it is exactly what I was going to sit down and write this afternoon.

I'd like to use this plugin to support the Vagrant Driver for Test Kitchen when dealing with Windows instances. You can take a peek at test-kitchen/kitchen-vagrant#155 if you want to see what I'm using this for.

Test Kitchen has a kitchen login method, not unlike vagrant ssh or recently vagrant rdp, and as we're all still waiting for WinRM Remoting from non-Windows systems, it seems like launching an RDP session is the thing to do in the meantime.

I'm wondering how receptive this project would be to adding/exposing the RDP Port to the vagrant winrm-config data hash. The name and/or implementation may not be 100%, but I wanted to see what an implementation looked like (and I have to solve this problem anyway for Test Kitchen). Thoughts?

Thanks again!

[Annih]

Seems good to me, I have no issue to integrate the rdp config in it.
Thanks to use and improve this plugin :)

[fnichol]

@Annih Major thanks to you, quickest turnaround ever!