Pull request 2149: 6711 watch hosts

Updates #6711.

Squashed commit of the following:

commit 3ddfe809f76325c2d4cda0715a7bcc15e76a2388
Merge: 185957cd0 d338451fa
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Feb 13 13:01:30 2024 +0300

    Merge branch 'master' into 6711-watch-hosts

commit 185957cd01516e5955e388108615e6f131d6ad71
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri Feb 9 18:11:41 2024 +0300

    aghos: imp docs

commit 3afbbcbb7ab6cc60c7c40ef8acd5b3ddf52cb3d1
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri Feb 9 15:40:02 2024 +0300

    all: upd golibs, imp fswatcher

internal/aghos/os_linux.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"syscall"
 
+	"github.com/AdguardTeam/golibs/osutil"
 	"github.com/AdguardTeam/golibs/stringutil"
 )
 
@@ -40,7 +41,7 @@ func isOpenWrt() (ok bool) {
 		}
 
 		return nil, !stringutil.ContainsFold(string(data), osNameData), nil
-	}).Walk(RootDirFS(), etcReleasePattern)
+	}).Walk(osutil.RootDirFS(), etcReleasePattern)
 
 	return err == nil && ok
 }