domainkeys: fix failing tests
domainkeys: fix failing tests

the previous DK commit moved the 'use Mail::DomainKeys::*' stuff into an eval. The right idea, but tests still fail because I forgot to remove the bare 'use' lines.

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