to is different from mysql_host parameter on instances, where it
   means -- what is the ip to connect to, so differentiate them

By default mysql listens on 0.0.0.0, but this is incorrect address to
connect to.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@38114 20353a03-c40f-0410-a6d1-a30d3c3de9de