Pull request: imp-tests

Merge in DNS/adguard-home from imp-tests to master

Squashed commit of the following:

commit ea5b4e7a93359ae4800f75e77d02944a4f5d2df8
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Thu Oct 27 15:12:45 2022 +0300

    all: imp tests, use testutil

internal/updater/updater_test.go

@@ -11,7 +11,6 @@ import (
 	"testing"
 
 	"github.com/AdguardTeam/AdGuardHome/internal/aghalg"
-	"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
 	"github.com/AdguardTeam/AdGuardHome/internal/version"
 	"github.com/AdguardTeam/golibs/testutil"
 	"github.com/stretchr/testify/assert"
@@ -21,7 +20,7 @@ import (
 // TODO(a.garipov): Rewrite these tests.
 
 func TestMain(m *testing.M) {
-	aghtest.DiscardLogOutput(m)
+	testutil.DiscardLogOutput(m)
 }
 
 func startHTTPServer(data string) (l net.Listener, portStr string) {