rename authsql to auth_vpopmail_sql -- we need a generic "connect to database"
thing with a generic way to configure databases. ... and then we should have
a more generic "check username with sql" plugin.
git-svn-id: https://svn.perl.org/qpsmtpd/trunk@253 958fd67b-6ff1-0310-b445-bb7760255be9
