Set password for all root accounts

It's necessary to use SET PASSWORD for the root@127.0.0.1 and root@::1
accounts, the command issued via mysqladmin will not work on these
according to
http://dev.mysql.com/doc/mysql-security-excerpt/5.5/en/default-privileges.html
Revert "Set password for all root accounts"

This reverts commit dd658cf11b982072f0010d170c22a0bd1a2f585a.