When a nil listener address is passed to some protocol specific
listen function, it will create an unnamed, unbound socket because
of the nil listener address. Other listener functions may return
invalid address error.

This CL allows to pass a nil listener address to all protocol
specific listen functions to fix above inconsistency. Also make it
possible to return a proper local socket address in case of a nil
listner address.

Fixes #4190.
Fixes #3847.

R=rsc, iant
CC=golang-dev
https://golang.org/cl/6525048