cdae86c Do not allow '%' in DM password

Authored and Committed by mkosek 10 years ago
    Do not allow '%' in DM password
    
    Having '%' in DM password causes pkispawn to crash. Do not allow
    users to enter it until pkispawn is fixed.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=953488