Ensure that the systemd-resolved DNS service is properly reverted
Ensure that the systemd-resolved DNS service is properly reverted

Revert the DNS config and link setting for the TUN-device when the
`systemd-resolved` based DNS service ends. This makes it possible
for the overriding resolver to do a proper take over.

Signed-off-by: Thomas Hallgren <5f50a84c1fa3bcff146405017f36aec1a10a9e38@datawire.io>

datawire/telepresence,datawire/telepresence,datawire/telepresence