* g10/gpg.c (oWithV5Fingerprint): New.
(opts): Add new option.
(main): Set option.
* g10/options.h (opt): Add with_v5_fingerprint.
* g10/keyid.c (hash_public_key): Factor out to ...
(do_hash_public_key): this.  Add new arg to foce v5 style hashing.
(v5_fingerprint_from_pk): New.
(v5hexfingerprint): New.
* g10/keylist.c (print_fingerprint): Print v5 fingerprint for v4 keys
if the option is set.