Add support for AF_INET(6) sockets via --socket-address=IP:PORT

I'd like to use unix addresses (for in-container use)

Signed-off-by: Sistason c3infra@sistason.de

requested review from @julian

assigned to @sistason

My idea of the existing options is to use --socket-path for testing and --socket-fd in conjunction with systemd socket units for anything other than testing. With systemd socket units is is already possible to bind a TCP socket.

I'd like to use unix addresses (for in-container use)

Since uffd-socketmapd already supports UNIX sockets natively and you're proposing to add support for TCP sockets, that does not really make sense.

So, what's your use-case and why is using a systemd socket unit not an option?

In a small docker container running python, possibly in Alpine, there is no systemd. I run the python file and nothing else.

Therefore, I want this script to open the socket, so the container is as simple as it gets.