general::SocketAddr: "inet" or "tcp"?

Currently, the qualified form for general::SocketAddr::Inet is e.g. "tcp:127.0.0.1:9999".

Should we change this to "inet:127.0.0.1:9999"?

This is just about the best time at which to do it, if we want to.

cc @jnewsome @Diziet — what do you think?