Turn opportunistic DoT into their own strategies.

This is beneficial since we prefer strategies according to their
performance.
Previously name servers were upgraded to opportunistic DoT if it was
available even if the round trip times went through the roof and there
was no way to got back to plain udp/53 DNS.
To make up a bit of space in the unwindctl status output, name servers
learned via DHCP or SLAAC are printed in a new subcommand.
The status output will be further improved shortly.
Input & OK otto

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