Support all resolvers in resolv.conf, and issue retries on errors the same way gethostbyname() does.
Support all resolvers in resolv.conf, and issue retries on errors the same
way gethostbyname() does.


git-svn-id: 5bd49132847c26fb0bf09d36ee8823e0080b2740@555 958fd67b-6ff1-0310-b445-bb7760255be9

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