Merge in DNS/adguard-home from fix-close to master
Squashed commit of the following:
commit 43b55105cc669e2740ef178808c81a22c8f53cc1
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date: Mon Feb 1 19:19:12 2021 +0300
dnsforward: fix closing of uninitialized ipset ctx