Fix the IPv6 case of tor_ersatz_socketpair
get_local_listener which is used by
sin6_family is currently being set to
AF_INET in the IPv6 case when
AF_INET6 should be used instead.
This code was introduced in commit 9b24609a from this past August, so this is not a brand-new problem.
I tested this on my OpenBSD box by forcing an IPv6 socket to be used for
tor_ersatz_socketpair and running the test suite. There is a test in the test suite that tests
tor_ersatz_socketpair: it (of course) fails using the current
AF_INET code but it passes when using
PR to follow to change
AF_INET6 in the IPv6 case.