mysql login requires password by default. We should change the DB
creation and connection string as below.
1. mysql -u root -pMYSQL_ROOT_PWD -e "create schema ironic"
2. sed -i ... root:MYSQL_ROOT_PWD@localhost ... ironic.conf.local
Change-Id: I19696a470055823a3b2edc45a48889945c255dfd
Closes-bug: #1520420