dirmngr: Limit the number of cached domains for WKD.
* dirmngr/domaininfo.c (MAX_DOMAINBUCKET_LEN): New. (insert_or_update): Limit the length of a bucket chain. (domaininfo_print_stats): Print just one summary line.
(cherry picked from commit 26f08343fbccdbaa177c3507a3c5e24a5cf94a2d)
- Signed-off-by: Werner Koch <wk@gnupg.org>