Fix some sample codes in POD section
Haineko::DNS is for Haineko::SMTPD::Relay::MX
Test cases for Haineko::DNS
Register DNS.pm into pkgdata_DATA macro at Makefile.am
Require Net::DNS
Change some variable names
Improved variable names
Update comment
Fix some syntax errors...
Delete unused property "mxrr"
Add description about properties which are ignored in Haineko::SMTPD::Relay::MX
Register MX.pm
Delete test case code for "mxrr" property
Test cases for Haineko::SMTPD::Relay::MX