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/dhcpd/v4_unix_test.go

@@ -482,7 +482,6 @@ func TestV4Server_updateOptions(t *testing.T) {
 
 		s, err := v4Create(conf)
 		require.NoError(t, err)
-
 		require.IsType(t, (*v4Server)(nil), s)
 
 		t.Run(tc.name, func(t *testing.T) {