Forward opeconnect usergroup

Aaron Barany requested to merge abarany/plasma-nm:master into master

Forward the usergroup for openconnect (provided by the URL path) to the NetworkManager service by incorporating it in NM_OPENCONNECT_KEY_GATEWAY. This ensures that the VPN session in the NetworkManager service uses the same usergroup as provided with the gateway when the initial connection was made through the UI.

BUG: 435561

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