An Config option to simply allow nested VM access

### The required feature described as a wish

As asked in this discusssion: https://github.com/apache/cloudstack/discussions/10225

I would like to have an easier way to allow network traffic to nested VM's in basic networking installations.

Currently you would need to manually "hack" the `security_group.py` script to just not execute anything at all.
This would be useful for inhouse non security sensitive installation where people could simply host e.g. test CloudStack installations
or other virtualization platforms to test.

Comienza con la discusión enlazada y el script security_group.py para entender el comportamiento solicitado y el manejo actual del tráfico. Define cómo una opción de configuración debe permitir el tráfico entre VM anidadas en Basic Networking sin modificar el script y, después, verifica que la opción funcione para la configuración de CloudStack descrita.

Escrito por el modelo de indexación a partir del texto del issue.