Fix IPv6 DNS nameserver and add split DNS support for systems using systemd-resolved

Florian Domainrequested to merge
fdomain/vpnc-scripts:resolvectl into master
  • use resolvectl instead of busctl (provides a simpler interface to configure DNS settings)
  • handles CISCO_SPLIT_DNS env variable

this changes allows to:

  • set an IPv6 DNS nameserver when using systemd-resolved
  • add split DNS domains and not only the default domain sent by the VPN server

this is a proposal to fix: #7 (closed)

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