Pull request: 2846 cover aghnet vol.4

Merge in DNS/adguard-home from 2846-cover-aghnet-vol.4 to master

Updates #2846.

Squashed commit of the following:

commit 576ef857628a403ce1478c10a4aad23985c09613
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Mar 31 19:38:57 2022 +0300

    aghnet: imp code

commit 5b4b17ff52867aaab2c9d30a0fc7fc2fe31ff4d5
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Mar 31 14:58:34 2022 +0300

    aghnet: imp coverage

scripts/make/go-lint.sh

@@ -134,9 +134,10 @@ underscores() {
 			-e '_bsd.go'\
 			-e '_darwin.go'\
 			-e '_freebsd.go'\
-			-e '_openbsd.go'\
 			-e '_linux.go'\
 			-e '_little.go'\
+			-e '_nolinux.go'\
+			-e '_openbsd.go'\
 			-e '_others.go'\
 			-e '_test.go'\
 			-e '_unix.go'\