Fix regexp patterns in parameters to not enforce length
    
    Regexp should not enforce lenght of string, we have different checks for
    that. Secondly regexp with length specified produces an incorrect error
    message.
    
    https://fedorahosted.org/freeipa/ticket/5822
    
    Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>