Parse /proc/net/route to find default route + outgoing iface #40
Description
Do this instead of assuming hostname(2) is resolvable. This is typically not the case on people's custom Ubuntu installs and whatnot. We keep the API the same but just change the default behavior.
See the default path in gloo::transport::tcp::CreateDevice (https://github.com/facebookincubator/gloo/blob/master/gloo/transport/tcp/device.cc#L36-L42).