[ubports/focal] config: keep the user and net namespaces
Backport: !126 (merged)
Needed for at least A-GPS, and probably also VoLTE, since this enables internet access by the android
lxc container.
Potential TODO could be figuring out a way to disable this, if the user does not want it, since it means vendor applications will always have access to the internet, which could be a privacy issue.