make this script usable again.
this change added the ability to include this script again without touching all scripts that include this - like `owncloud-unlockadmin.sh`. I guess without this change those scripts would harm more than that it helps.
* Passwords must be at least four characters. So we need to check them
here to ensure that first user creation works during initial setup
* Change quotes to match rest of code
Currently read_password does not verify password length. But further down the chain, passwords are checked to make sure they are longer than four characters.
If during initial setup, the user enters a password that is shorter than four characters, this will not be caught here, but when the script actually calls management/mailconfig.py to add the user, it will fail without a chance to correct the short password.
The setup script will then continue without an inital user being created and this will confuse users.
* Created a new Python/flask-based management daemon.
* Moved the mail user management core code from tools/mail.py to the new daemon.
* tools/mail.py is a wrapper around the daemon and can be run as a non-root user.
* Adding a new initscript for the management daemon.
* Moving dns_update.sh to the management daemon, called via curl'ing the daemon's API.
This also now runs the DNS update after mail users and aliases are added/removed,
which sets up new domains' DNS as needed.
