Merge pull request #59 from phunehehe/clean-mysql

rid of unused attributes
Merge pull request #60 from phunehehe/postfix-dkim

Postfix dkim
fix https://www.chiliproject.org/issues/1295 for chili 3.8.0
Merge pull request #61 from nhannguyen/chili

fix https://www.chiliproject.org/issues/1295 for chili 3.8.0
attribute checks for sasl_auth