GunicornWebWorker: Support for unix domain sockets

[devoto13]

At the moment GunicornWebWorker doesn't support unix domain sockets. I think it can be fixed by checking for socket type and not setting host and port for unix domain sockets. Something like:

    @asyncio.coroutine
    def _run(self):
        for sock in self.sockets:
            if isinstance(sock, gunicorn.sock.UnixSocket):
                handler = self.make_handler(self.wsgi, "", 0)
            else:
                handler = self.make_handler(self.wsgi, *sock.cfg_addr)
            srv = yield from self.loop.create_server(handler, sock=sock.sock)
            self.servers[srv] = handler

        ...

From other side I am really not sure, why does ServerHttpProtocol contains host and port. They are not used and probably not needed. So better solution would probably be to remove them completely. But it will break backwards compatibility though.

If you think either of this solutions is fine, let me know and I'll provide a pull request.

---

As a side question I want to ask why does aiohttp has it's own worker instead of being compatible with the WSGI spec and Gunicorn's gaiohttp worker? I found this comment, but it was never answered...

[fafhrd91]

originally i wrote wsgi compatible gunicorn worker. right now i do not have enough time to unify both workers and submit to gunicorn repo.

[asvetlov]

Fixed by 1ac5e26

[lock]

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