[racket] Intro Projects: Get rid of units in the net collect

For the most part, getting rid of units in net is straightforward.
However, I'm not sure what people have in mind for the tcp^ sig.

1) net/tcp-redirect provides a single function, tcp-redirect, which
returns a unit implementing tcp^. Is there a consensus on what to do
with this function? Remove it? Have it return, instead, (values ...)?
I don't see any uses of it in collects.

2) net/ssl-tcp-unit.rkt: should this simply define all of the tcp-
functions from racket/tcp?

Or do we keep tcp^ around and just get rid of the other units?