After CL 156597 it's no longer necessary to initialize the ctlOpts and
sockOpts tables in the init func. Instead, just directly initialize them.

Change-Id: I62b4dd980b3cb87e3cbc71ea4874f6512b5cfefa
Reviewed-on: https://go-review.googlesource.com/c/156797
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>