gpg: Improve the "secret key available" notice in keyedit.c
560d85ecff42
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gpg: Improve the "secret key available" notice in keyedit.c

* g10/keyedit.c (KEYEDIT_NEED_SUBSK): New.
(cmds): Add this flag to keytocard, bkuptocard, expire, and passwd.
(keyedit_menu): Check whether only subkeys are available and take care
of that in the command check and in the HELP listing.  Also print a
different notice if only subkeys are available.

Print "Secret key is available" and the bailing out in all commands
which require the _primary_ secret key was surprising. Now we print
another notice and adjust the checks.

GnuPG-bug-id: T3463
Signed-off-by: Werner Koch <wk@gnupg.org>