Default for sandbox to use the host network

[xingyaoww]

This PR switch back to using --network=host as a default.

The --network=host is now supported with the newest version of Docker Desktop for MacOS - this was the only reason iirc that stopped us from using it before.

Version Docker Desktop 4.29.0
Settings ⇒ Features in development ⇒ Enable host networking
Host networking allows containers that are started with --net=host to use localhost to connect to TCP and UDP services on the host. It will automatically allow software on the host to use localhost to connect to TCP and UDP services in the container. Sign in required.

Originally posted by @4-FLOSS-Free-Libre-Open-Source-Software in docker/roadmap#238 (comment)