agent: Make --ssh-fingerprint-digest re-readable.
* agent/gpg-agent.c (main): Move oSSHFingerprintDigest to ... (parse_rereadable_options): here. (opts): Change its description. (main) <aGPGConfList>: Include this option. * tools/gpgconf-comp.c (gc_options_gpg_agent): Add option at expert level.
- Signed-off-by: Werner Koch <wk@gnupg.org>