Use sockaddr_snprintf()

Add support for lastlogx output. Unfortunately not many programs use it
yet.

Import of lastlogin from John M. Vinopal, from PR #1932.
RCS ID changes from PR. Updated man page for NetBSD 1.2 instead
of NetBSD 1.1. If this program is merged with last(1), then
it will be remo

Import of lastlogin from John M. Vinopal, from PR #1932.
RCS ID changes from PR. Updated man page for NetBSD 1.2 instead
of NetBSD 1.1. If this program is merged with last(1), then
it will be removed.

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