* {etype} krb5_enctype, display shortest name of enctype
* {etypes} krb5_enctype *, display list of enctypes
* {ccache} krb5_ccache, display type:name
+ * {keytab} krb5_keytab, display name
* {creds} krb5_creds *, display clientprinc -> serverprinc
*/