Update postfixadmin to version 3.3.1 / rev 31 via SR 862722
    
    https://build.opensuse.org/request/show/862722
    by user cboltz + dimstar_suse
    - Update to PostfixAdmin 3.3.1
      - switch of bootstrap theme
      - let setup.php display less information
      - change internal database routines to use PHP's PDO
      - various improvements and bug fixes
      - new setup password hashing method (you'll need to create a new
        $CONF['setup_password']) (forwarded request 862721 from cboltz)