Code review comment for lp:~harlowja/cloud-init/fix-passwd

I dont have a good explanation for why system accounts would differ from non-system accounts with reguard to 'lock_passwd'. So, I'm just going to simplify this to:
+ # Default locking down the account. 'lock_passwd' defaults to True.
+ # lock account unless lock_password is False.
+ if kwargs.get('lock_passwd', True):

My simple test on 12.04 shows that 'passwd -l USER' works fine even if user's entry in /etc/shadow has '*' (which means 'no password').