dirmngr: Improve concurrency in the non-adns case.
* dirmngr/dns-stuff.c (map_adns_status_to_gpg_error): New. (resolve_name_adns, get_dns_cert, get_dns_cname): Use that function. (getsrv) [!USE_ADNS]: Call res_query outside of nPth.
- Signed-off-by: Werner Koch <wk@gnupg.org>