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Streamline configuration and operation of dns forwarding service in
following ways:
- Remove `dns_forwarding_reset.py` as its functionality is now covered
by `dns.py`
- Adjust function names in `dns.py` to disambiguate between DNS
forwarding and dynamic DNS
- Remove `dns_forwarding_restart.sh` as its functionality is inlined in
`dns-forwarding.xml`
- Templatize systemd override for `pdns-recursor.service` and move the
generated override files in /run. This ensures that the override files
are always generated afresh after boot
- Simplify the systemd override file by removing the redundant overrides
- Relocate configuration path for pdns-recursor to `/run/pdns-recursor`
and utilize the `RuntimeDirectory` default that pdns-recursor expects
- We do not need to use custom `--socket-dir` path anymore, the default
path (viz., `/run/pdns-recursor` is fine)
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