changed the method of saving results. Instead of appending to/from a header, plugins save results to a connection note.
Qpsmtpd::SMTP.pm has a new method that inserts the Authentication-Results header
The smtp-auth information has been removed from the Received header
Authentication-Results providing plugins have been updated to store results in connection note
if QP passes in tainted data, such as a hostname that subsequently gets used to open a connection using IO::Socket, the plugin die because the information is tainted. Fix it once here, instead of in each plugin.
