Implemented PostfixMilterConf, class to updated the smtpd_milters line
in postfix main.cf.
Modified PostfixIntegrate to use PostfixMilterConf.
Need to implement unit test for PostfixMilterConf.
git-svn-id: https://svn.microneil.com/svn/SNFUtility/trunk@49 aa37657e-1934-4a5f-aa6d-2d8eab27ff7c