dirmngr: Addlow fetching keys using OpenPGP DANE
* dirmngr/server.c (cmd_dns_cert): Add option --dane.
This implements draft-ietf-dane-openpgpkey-05.txt
To test this use
$ gpg-connect-agent --dirmngr > /hex > dns_cert --dane wk@gnupg.org
- Signed-off-by: Werner Koch <wk@gnupg.org>