Implement a new vpn connection setting to allow not adding a route to the external gateway

Closed Frédéric Martinsons requested to merge fmartinsons/NetworkManager:fm/204-vpn-in-vpn into main

This setting allows an user to deactivate the automatic route addition to the external gateway. It can be especially usefull when a VPN inside another VPN is used

Fixes #204 (closed)

Signed-off-by: Frederic Martinsons

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