gpg: Add magic parameter "default" to --quick-add-adsk.
* g10/getkey.c (has_key_with_fingerprint): New. * g10/keyedit.c (menu_addadsk): Replace code by new function. (keyedit_quick_addadsk): Handle magic arg "default". * g10/keygen.c (append_all_default_adsks): New.
- GnuPG-bug-id: T6882