wireguard-go: custom socket dir through environment variable

[Svet Bajlekov]

Greetings,
In the userspace implementation, would there be any interest in making the
socket directory (/var/run/wireguard) customizable via an environment
variable?

My use case for this is that I'd like to install and use WireGuard as a
snapcraft package*, and the respective confinement restricts access to
/var/run. Either way, having the ability to customize the path seems like
sensible functionality.

The code change itself is of course pretty simple. I had a go at it here (
https://github.com/WireGuard/wireguard-go/compare/master...svet-b:0.0.20181018)
where an optional WG_SOCKET_DIR variable is introduced - and what I did
works, though I have to admit that it's the first time I've ever written
anything in go, so what I did is pretty ugly. Therefore I figured I'd reach
out on this mailing list rather than submit a pull request.

Thanks, and keep up the great project!
Svet

*Yes, I understand that running the userspace implementation in Linux is
not exactly ideal. I'm doing it on devices where I can't install kernel
modules, and where squeezing out performance is not that important.
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