gpg: Avoid asking by fpr and then by keyid during auto-key-retrieve.
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gpg: Avoid asking by fpr and then by keyid during auto-key-retrieve.

* g10/mainproc.c (check_sig_and_print): Track key server request via
fingerprint.

New signatures carry the fingerprint and thus --auto-key-retrieve tries
to lookup the key by fingerprint. If that failed it used to also ask
the same thing by KEYID - but the keyid is part of the fingerprint and
thus it will either get no response or the wrong key back. We can
easily avoid this.