nm-settings-nmcli: show proper valid values of ip-tunnel properties

Íñigo Huguet requested to merge ih/tunnel_mode_doc into main


Show all valid properties for ip-tunnel.mode, not only 2 examples.

Show constants as values suitable for user input in nmcli. That means showing, for example, "ipip (1)" instead of "IP_TUNNEL_MODE_IPIP (1)".


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  • the subject for all commits is concise and explicative
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  • the source is properly formatted
  • any relevant documentation is up to date
  • you have added unit tests if applicable

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