Changes:
-config cleanup
-add functions.sh for common function used in DOT
-update readme

Fix private key permissions

- Add : to variant
- Corrected SPDX License Identifier

And configure restart proxy hook

- Rename Certgen binary
- Update to version 6.1
  - Wait delay limits
  - Hooks directory
  - Private key permissions

CA certificate is used by Sentinel:Proxy itself and in fact,
Sentinel:Certgen does not know anything about MQTT server which Proxy
communicates with and has certificate signed by this CA

Changes:
-add polishing from https://github.com/openwrt/packages/pull/9223
-add PKG_BUILD_DEPENDS with setuptools

Changes:
-Makefile polishing from https://github.com/openwrt/packages/pull/9161
-add build dependecy for setuptools

Note: it is used in ludus web app

Restarting kresd in background is problematic, as it often happened
that it wasn't running at the following moment when we're trying to pipe
commands into it.  Consequently, we sometimes couldn't see verbose logs.

foris-controller-netboot-module: init script renamed '/etc/init.d/foris-netboot-observer.init' -> /etc/init.d/foris-netboot-observer