python: Fix key_export*.
python: Fix key_export*.

* lang/python/src/core.py (key_export): Just raise an error.
(key_export_minimal, key_export_secret): Ditto.

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GnuPG-bug-id: 5149
Fixes-commit: 7faef33d13fa8efce152ca7aa6e9d39030c1cf08
Signed-off-by: NIIBE Yutaka <34feb69f206f6fec69fb4bd79c126fcbde2c8e6a@fsij.org>

gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme