scd: Support KDF DO setup.
* g10/call-agent.c (learn_status_cb): Parse the capability for KDF. * g10/card-util.c (gen_kdf_data, kdf_setup): New. (card_edit): New admin command cmdKDFSETUP to call kdf_setup. * scd/app-openpgp.c (do_getattr): Emit KDF capability.
- GnuPG-bug-id: T3823
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>