Fix two instances of asserting AF_INET

The http-proxy and socks-proxy work fine with IPv6 but assert having IPv4
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1385064495-25877-6-git-send-email-arne@rfc2549.org>
URL: http://article.gmane.org/gmane.network.openvpn.devel/8010

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