add minNonAlpha

Request: 12243
Signed-off-by: Jan Schneider <jan@horde.org>
add minNonAlpha

Request: 12243
Signed-off-by: Jan Schneider <jan@horde.org>
[jan] Add policy for minimum number of non-alphanumeric characters (Friedrich Haubensak <hsk@fli-leibniz.de>, Request #12243).