Pull request: 5191-update-flag

Merge in DNS/adguard-home from 5191-update-flag to master

Updates #5191.
Updates #4223.

Squashed commit of the following:

commit fbace4942844dc67f2467479385e06843c3abb6a
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Jan 9 12:05:16 2023 +0400

    all: imp code, docs

commit 8237dceb771ba95f545f79565d76cbb4ebd0d805
Merge: ca9518f2 bbdcc673
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri Dec 30 14:45:55 2022 +0400

    Merge branch 'master' into 5191-update-flag

commit ca9518f20e5643572adf9734b93a5436ba30c865
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Dec 29 20:36:33 2022 +0400

    home: imp code

commit 1dc6c7c3480df3df4a5f3f923f1feab7761a7945
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Dec 29 18:26:08 2022 +0400

    all: imp code, docs

commit 7bbe893e98063b956482fd6f1c6be95a4f1956cf
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Dec 29 03:44:48 2022 +0400

    home: restart service on update

commit e0d3c287a7e1c05b1e397f4727c447a1fcd9f7f6
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Dec 29 03:22:49 2022 +0400

    all: update on first run

commit 0aa4e78f03bf3819425accb468ce59e747506ef3
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Dec 29 02:47:30 2022 +0400

    all: move some code to init less

commit 68aebfa050b9965afef26653e9b699ff4aaf5b8b
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Dec 29 00:36:00 2022 +0400

    WIP

commit 2c7fb97d701ac158613c5a3a4d4d35c5b79b3d59
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Wed Dec 28 14:15:59 2022 +0400

    home: imp logs

commit 4b06d089da835d6d187803bbb5ca1caf9973e2d3
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Dec 27 19:21:17 2022 +0400

    all: fix update flag

internal/home/service_openbsd.go

@@ -30,6 +30,8 @@ import (
 // sysVersion is the version of local service.System interface implementation.
 const sysVersion = "openbsd-runcom"
 
+// chooseSystem checks the current system detected and substitutes it with local
+// implementation if needed.
 func chooseSystem() {
 	service.ChooseSystem(openbsdSystem{})
 }