Fix UDP DNS queries in addns

Fix UDP DNS queries in addns

The addns code tries to use common approach for TCP and UDP queries,
calling connect() for both types of sockets. In case of UDP that
requires to use send() instead of sendto().

Signed-off-by: Timur I. Bakeyev <timur@iXsystems.com>
Reviewed-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Wed Jun 13 03:51:04 CEST 2018 on sn-devel-144