'Option domain' not changed by "Domain of DHCP clients in DNS" setting
Visiting page `/foris/config/main/dns/` (foris) or `/reforis/network-settings/dns` (reforis)
then changing value in "Domain of DHCP clients in DNS" to: *home.arpa*
Option 'Enable DHCP clients in DNS' is enabled.
it will change only `option local` and not `option domain` in file: /etc/config/dhcp
```config
option local '/home.arpa/'
option domain 'lan'
```
as can be seen in code at:
https://gitlab.labs.nic.cz/turris/foris-controller/foris-controller/-/blob/aa868245cdeba85fcad675be7f73646888c7592f/foris_controller_backends/dns/__init__.py#L272-275
```python
if dns_from_dhcp_domain:
backend.set_option(
"dhcp", "@dnsmasq[0]", "local", "/%s/" % dns_from_dhcp_domain.strip("/")
)
```
The file /etc/resolv.conf will use the value of `option domain` for `search` like:
`search lan`
thus nslookup will fail (NXDOMAIN) for *compname*, but will work for *compname.home.arpa*
fix:
change value `option domain` as well to use value from "Domain of DHCP clients in DNS" (but not enclosed in / chars as used in local option), so will result in following change:
```config
option local '/home.arpa/'
option domain 'home.arpa'
```
this will make nslookup *compname* works
issue