Add ability to set DNS resolver search domain list
As it exists right now, the Domain set in System > General is added as a search domain in /etc/resolv.conf.
It would be nice to have a way to set additional search domains.
Perhaps something like a comma-separated list of "Additional DNS search domains" in a field below the domain there. Or perhaps down in the DNS configuration area.
Consideration should probably also be given to search domains provided from a WAN DHCP server. Probably controlled by the override checkbox there or a separate, similar toggle.
I don't see a category that really fits so I'm setting DNS Resolver here.
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