Christian Manivong
5a6e573300
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When Kea, ISC DHCP and the ARP fallback all failed, get_dhcp_leases() returned [], which a caller cannot tell from a server with no leases. It now raises a RuntimeError naming each failure, and returns [] only when a source answered with nothing. An empty ARP table after both lease sources failed counts as unread too, since ARP rows are no lease data. Closes #27