RFE: Add `connection.llmnr` to set systemd-resolved's link-specific LLMNR value

Request For Enhancement:

Add setting to control systemd-resolved's LLMNR interface-specific value.

Systemd-resolved provides setting for two similar protocols (LLMNR and MDNS). Feature to control MDNS was added to NetworkManager in commit c03a5349 under the name connection.mdns.

Going by that, the new setting for LLMNR could be connection.llmnr = string ("yes"/"no"/"resolve").

LLMNR: Protocol to resolve local network hostnames via multicast UDP
MDNS: Protocol to resolve local network hostnames under ".local" domain via multicast UDP

Edit: Had mixed up the definition of LLMNR and MDNS. Now corrected.

Edited Aug 31, 2018 by Gima

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