Correct a SQL error when happen after 2nd boot by 'vagrant up' command

Hi

I used this, it is very good. So I forked and translated readme in Japanese. And did some changed. So feedback to original yours.

When after 2nd 'vagrant up' this make MySQL error at last of set up procedure. Because of using 'CREATE USER' for root user.

By 'GRANT' statment, also can make new user. So deleted 'CREATE' and added password setting into GRANT.