Add default 'ADMIN' role and grant it to 'admin' user.
Grant 'ADMIN' role the ext and it's dependencies.
Also grant 'ADMIN' role any priv when it's added.
Remove test priv and ext setup. It's no longer needed for admin user.
Merge pull request #1579 from bendiy/ext-grant

Grant 'ADMIN' role the ext and it's dependencies.