When mysq_host is 0.0.0.0 it broken the site creation, because instance cannot...

When mysq_host is 0.0.0.0 it broken the site creation, because instance cannot connect on mysql (due user@localhost connection). This commit fixes tutorial.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@37388 20353a03-c40f-0410-a6d1-a30d3c3de9de