dspam: remove hard coded default in train_ methods
dspam: remove hard coded default in train_ methods

priyadi/qpsmtpd,priyadi/qpsmtpd,smtpd/qpsmtpd,priyadi/qpsmtpd,sieutruc/qpsmtpd,salvis/qpsmtpd,salvis/qpsmtpd,sieutruc/qpsmtpd,msimerson/qpsmtpd,msimerson/qpsmtpd,smtpd/qpsmtpd,sieutruc/qpsmtpd