gpg: Update --trusted-key to accept fingerprint as well as long key id.
* g10/trustdb.c (tdb_register_trusted_key): accept fingerprint as well as long key ID. * doc/gpg.texi: document that --trusted-key can accept a fingerprint.
- GnuPG-bug-id: T4855
- Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>