gpg: Print PGP-2 fingerprint instead of all zeroes.
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Description

gpg: Print PGP-2 fingerprint instead of all zeroes.

* g10/keyid.c (fingerprint_from_pk): Allow PGP-2 fingerprints.
* g10/keylist.c (print_fingerprint): Print a warning after a PGP-2
fingerprint.

Printing all zeroes for a PGP-2 (v3 key) fingerprint has the problem
that frontends (or the user) may use that fingerprint to lookup a key
and gpg will return all PGP2 keys. They may then show a different
PGP-2 key than the one actually used for a signature. This is worse
than displaying a weak fingerprint.

GnuPG-bug-id: T2000
Signed-off-by: Werner Koch <wk@gnupg.org>