adding help about capath and yubi_attr_prefix parameters
adding help about capath and yubi_attr_prefix parameters

madrat-/yubico-pam,Yubico/yubico-pam,eworm-de/yubico-pam,madrat-/yubico-pam,Yubico/yubico-pam,madrat-/yubico-pam,Yubico/yubico-pam,eworm-de/yubico-pam,eworm-de/yubico-pam