dirmngr: Load the hosts file into libdns.
* dirmngr/dns-stuff.c (libdns_init): Actually load the hosts file into libdns.
Previously, connecting to key servers specified in /etc/hosts was not
possible because libdns' hosts structure was initialized, but not
filled with the content of the hosts file.
- GnuPG-bug-id: T2977
- Signed-off-by: Justus Winter <justus@g10code.com>