Allow Wireguard as secondary
Summary
As of now, NM allows only connections derived from the VPN plugin to be used as secondaries. This excludes non-VPN-plugin connections still providing VPN functionality, such as Wireguard, to be used as secondary. This commit extends NetworkManager to allow it to be used as secondary.
Purpose
Treat Wireguard also as VPN.
Fixes #1395
Checklist
Please read https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/CONTRIBUTING.md before opening the merge request. In particular, check that:
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the subject for all commits is concise and explicative -
the message for all commits explains the reason for the change -
the source is properly formatted -
any relevant documentation is up to date -
you have added unit tests if applicable