template: use * in /etc/shadow for root and user account
|Reported by:||joanna||Owned by:||joanna|
|Priority:||minor||Milestone:||Release 1 Alpha 2|
The user will still be able to start apps via qvm-run -u, but not trivially escalate to root in a VM via su.
Additionally we should configure pam to allow log in via console without any password. This is for debugging and emergency access to the VMs via xm console.