Simplify print_sockaddr_ex function, merge duplicate ipv4/ipv6 logic.

Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1385064495-25877-2-git-send-email-arne@rfc2549.org>
URL: http://article.gmane.org/gmane.network.openvpn.devel/8023

Signed-off-by: Gert Doering <gert@greenie.muc.de>