interfaces: hostname lookups for autodiscovery hosts page

[fichtner]

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As reported here it may be nice to add a similar name resolving into the page like firewall live log or others:

https://www.reddit.com/r/opnsense/comments/1qdnoc6/comment/nzy6luf/

Parking this as a feature with me for now, but need to discuss internally.

[IngwiePhoenix]

CCing myself; idea was from me. :)