dns: add wildcard domain to VPNs with never-default=no and no domains

Closed Beniamino Galvani requested to merge bg/dns-vpn into master

If a VPN has never-default=no but doesn't get a default route (this can happen for example when the server pushes routes with openconnect), and there are no search domains, then the name servers pushed by the server would be unused. It is preferable in this case to use the VPN DNS server for all queries.


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