(patch remade against latest rspier/qpsmtpd)
added remote_port, local_ip, local_port, and local_host to $qp->connection, as the p0f plugin relies on it.
added notes to TcpServer.pm and the p0f plugin noting the dependence, and the lack of support for models other than tcpserver.
Signed-off-by: Robert <rspier@pobox.com>