Add support of Unix socket #912

This may probably resolve #872, but the limitation is that this implementation doesn't allow both unix and tcp, not sure if @Dave will be happy with this

I'm perfectly ok with that, first of all because you provided the code :D and secondly because the entire point of a unix domain socket is to avoid the TCP/IP stack in the first place. See this:

https://serverfault.com/questions/124517/what-is-the-difference-between-unix-sockets-and-tcp-ip-sockets

and look at Peter Green's decently formed answer to this question.

Thank you for this code.

Looks great!

I think we can merge this once the CI passes.

Thanks for the PR.

Ah, looks like the CI passed but not in the commit from before. I'll merge this now.

This works as of the git pull I did today. :) Thank you.

Add support of Unix socket #912

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